In this case we address the question left open by our decision nearly 18 years ago in Witherspoon v. Illinois, 391 U.S. 510, 88 S.Ct. 1770, 20 L.Ed.2d 776 (1968): Does the Constitution prohibit the removal for cause, prior to the guilt phase of a bifurcated capital trial, of prospective jurors whose opposition to the death penalty is so strong that it would prevent or substantially impair the performance of their duties as jurors at the sentencing phase of the trial? See id., at 520, n. 18, 88 S.Ct., at 1776, n. 18; Bumper v. North Carolina, 391 U.S. 543, 545, 88 S.Ct. 1788, 1790, 20 L.Ed.2d 797 (1968). We hold that it does not.

Respondent Ardia McCree filed a habeas corpus petition in the United States District Court for the Eastern District of Arkansas claiming that such removal for cause violated the Sixth and Fourteenth Amendments and, after McCree's case was consolidated with another habeas case involving the same claim on remand from the Court of Appeals for the Eighth Circuit, the District Court ruled in McCree's favor and granted habeas relief. Grigsby v. Mabry, 569 F.Supp. 1273 (1983). A sharply divided Eighth Circuit affirmed, Grigsby v. Mabry, 758 F.2d 226 (1985) (en banc), creating a conflict with recent decisions of the Fourth, Fifth, Seventh, and Eleventh Circuits. See Keeten v. Garrison, 742 F.2d 129, 133-135 (CA4 1984), cert. pending, No. 84-6187; Smith v. Balkcom, 660 F.2d 573, 576-578 (CA5 1981), modified on other grounds, 671 F.2d 858, cert. denied sub nom. Tison v. Arizona, 459 U.S. 882, 103 S.Ct. 181, 74 L.Ed.2d 148 (1982); Spinkellink v. Wainwright, 578 F.2d 582, 594 (CA5 1978), cert. denied, 440 U.S. 976, 99 S.Ct. 1548, 59 L.Ed.2d 796 (1979); United States ex rel. Clark v. Fike, 538 F.2d 750, 761-762 (CA7 1976), cert. denied, 429 U.S. 1064, 97 S.Ct. 791, 50 L.Ed.2d 781 (1977); and Corn v. Zant, 708 F.2d 549, 564 (CA11 1983), cert. denied, 467 U.S. 1220, 104 S.Ct. 2670, 81 L.Ed.2d 375 (1984). We granted certiorari to resolve the conflict, 474 U.S. 816, 106 S.Ct. 59, 88 L.Ed.2d 48 (1985), and now reverse the judgment of the Eighth Circuit.

On the morning of February 14, 1978, a combination gift shop and service station in Camden, Arkansas, was robbed, and Evelyn Boughton, the owner, was shot and killed. That afternoon, Ardia McCree was arrested in Hot Springs, Arkansas, after a police officer saw him driving a maroon and white Lincoln Continental matching an eyewitness' description of the getaway car used by Boughton's killer. The next evening, McCree admitted to police that he had been at Boughton's shop at the time of the murder. He claimed, however, that a tall black stranger wearing an overcoat first asked him for a ride, then took McCree's rifle out of the back of the car and used it to kill Boughton. McCree also claimed that, after the murder, the stranger rode with McCree to a nearby dirt road, got out of the car, and walked away with the rifle. McCree's story was contradicted by two eyewitnesses who saw McCree's car between the time of the murder and the time when McCree said the stranger got out and walked away, and who stated that they saw only one person in the car. The police found McCree's rifle and a bank bag from Boughton's shop alongside the dirt road. Based on ballistics tests, a Federal Bureau of Investigation officer testified that the bullet that killed Boughton had been fired from McCree's rifle.

McCree was charged with capital felony murder in violation of Ark.Stat.Ann. § 41-1501(1)(a) (1977). In accordance with Arkansas law, see Neal v. State, 259 Ark. 27, 31, 531 S.W.2d 17, 21 (1975), the trial judge at voir dire removed for cause, over McCree's objections, those prospective jurors who stated that they could not under any circumstances vote for the imposition of the death penalty. Eight prospective jurors were excluded for this reason. The jury convicted McCree of capital felony murder, but rejected the State's request for the death penalty, instead setting McCree's punishment at life imprisonment without parole. McCree's conviction was affirmed on direct appeal, McCree v. State, 266 Ark. 465, 585 S.W.2d 938 (1979), and his petition for state post-conviction relief was denied.

McCree then filed a federal habeas corpus petition raising, inter alia, the claim that "death qualification," or the removal for cause of the so-called "Witherspoon -excludable" prospective jurors,1 violated his right under the Sixth and Fourteenth Amendments to have his guilt or innocence determined by an impartial jury selected from a representative cross section of the community. By stipulation of the parties, this claim was consolidated with another pending habeas case involving the same claim, which had been remanded by the Eighth Circuit for an evidentiary hearing in the District Court. App. 9-11; Grigsby v. Mabry, 637 F.2d 525 (1980). The District Court denied the remainder of McCree's petition, and the Eighth Circuit affirmed. McCree v. Housewright, 689 F.2d 797 (1982), cert. denied, 460 U.S. 1088, 103 S.Ct. 1782, 76 L.Ed.2d 352 (1983).

The District Court held a hearing on the "death qualification" issue in July 1981, receiving in evidence numerous social science studies concerning the attitudes and beliefs of "Witherspoon -excludables," along with the potential effects of excluding them from the jury prior to the guilt phase of a bifurcated capital trial. In August 1983, the court concluded, based on the social science evidence, that "death qualification" produced juries that "were more prone to convict" capital defendants than "non-death-qualified" juries. Grigsby v. Mabry, 569 F.Supp., at 1323. The court ruled that "death qualification" thus violated both the fair-cross-section and impartiality requirements of the Sixth and Fourteenth Amendments, and granted McCree habeas relief. Id., at 1324.2

The Eighth Circuit found "substantial evidentiary support" for the District Court's conclusion that the removal for cause of "Witherspoon -excludables" resulted in "conviction-prone" juries, and affirmed the grant of habeas relief on the ground that such removal for cause violated McCree's constitutional right to a jury selected from a fair cross section of the community. Grigsby v. Mabry, 758 F.2d, at 229. The Eighth Circuit did not address McCree's impartiality claim. Ibid. The Eighth Circuit left it up to the discretion of the State "to construct a fair process" for future capital trials that would comply with the Sixth Amendment. Id., at 242-243. Four judges dissented. Id., at 243-251.

Before turning to the legal issues in the case, we are constrained to point out what we believe to be several serious flaws in the evidence upon which the courts below reached the conclusion that "death qualification" produces "conviction-prone" juries.3 McCree introduced into evidence some 15 social science studies in support of his constitutional claims, but only 6 of the studies even purported to measure the potential effects on the guilt-innocence determination of the removal from the jury of "Witherspoon -excludables."4 Eight of the remaining nine studies dealt solely with generalized attitudes and beliefs about the death penalty and other aspects of the criminal justice system, and were thus, at best, only marginally relevant to the constitutionality of McCree's conviction.5 The 15th and final study dealt with the effects on prospective jurors of voir dire questioning about their attitudes toward the death penalty,6 an issue McCree raised in his brief to this Court but that counsel for McCree admitted at oral argument would not, standing alone, give rise to a constitutional violation.7

Of the six studies introduced by McCree that at least purported to deal with the central issue in this case, namely, the potential effects on the determination of guilt or innocence of excluding "Witherspoon -excludables" from the jury, three were also before this Court when it decided Witherspoon.8 There, this Court reviewed the studies and concluded:

"The data adduced by the petitioner . . . are too tentative and fragmentary to establish that jurors not opposed to the death penalty tend to favor the prosecution in the determination of guilt. We simply cannot conclude, either on the basis of the record now before us or as a matter of judicial notice, that the exclusion of jurors opposed to capital punishment results in an unrepresentative jury on the issue of guilt or substantially increases the risk of conviction. In light of the presently available information, we are not prepared to announce a per se constitutional rule requiring the reversal of every conviction returned by a jury selected as this one was." 391 U.S., at 517-518, 88 S.Ct., at 1774-75 (footnote omitted).

It goes almost without saying that if these studies were "too tentative and fragmentary" to make out a claim of constitutional error in 1968, the same studies, unchanged but for having aged some 18 years, are still insufficient to make out such a claim in this case.

Nor do the three post-Witherspoon studies introduced by McCree on the "death qualification" issue provide substantial support for the "per se constitutional rule" McCree asks this Court to adopt. All three of the "new" studies were based on the responses of individuals randomly selected from some segment of the population, but who were not actual jurors sworn under oath to apply the law to the facts of an actual case involving the fate of an actual capital defendant.9 We have serious doubts about the value of these studies in predicting the behavior of actual jurors. See Grigsby v. Mabry, 758 F.2d, at 248, n. 7 (J. Gibson, J., dissenting). In addition, two of the three "new" studies did not even attempt to simulate the process of jury deliberation,10 and none of the "new" studies was able to predict to what extent, if any, the presence of one or more "Witherspoon -excludables" on a guilt-phase jury would have altered the outcome of the guilt determination.11

Finally, and most importantly, only one of the six "death qualification" studies introduced by McCree even attempted to identify and account for the presence of so-called "nullifiers," or individuals who, because of their deep-seated opposition to the death penalty, would be unable to decide a capital defendant's guilt or innocence fairly and impartially.12 McCree concedes, as he must, that "nullifiers" may properly be excluded from the guilt-phase jury, and studies that fail to take into account the presence of such "nullifiers" thus are fatally flawed.13 Surely a "per se constitutional rule" as far reaching as the one McCree proposes should not be based on the results of the lone study that avoids this fundamental flaw.

Having identified some of the more serious problems with McCree's studies, however, we will assume for purposes of this opinion that the studies are both methodologically valid and adequate to establish that "death qualification" in fact produces juries somewhat more "conviction-prone" than "non-death-qualified" juries. We hold, nonetheless, that the Constitution does not prohibit the States from "death qualifying" juries in capital cases.

The Eighth Circuit ruled that "death qualification" violated McCree's right under the Sixth Amendment, as applied to the States via incorporation through the Fourteenth Amendment, see Duncan v. Louisiana, 391 U.S. 145, 148-158, 88 S.Ct. 1444, 1446-52, 20 L.Ed.2d 491 (1968), to a jury selected from a representative cross section of the community. But we do not believe that the fair-cross-section requirement can, or should, be applied as broadly as that court attempted to apply it. We have never invoked the fair-cross-section principle to invalidate the use of either for-cause or peremptory challenges to prospective jurors, or to require petit juries, as opposed to jury panels or venires, to reflect the composition of the community at large. See Duren v. Missouri, 439 U.S. 357, 363-364, 99 S.Ct. 664, 668, 58 L.Ed.2d 579 (1979); Taylor v. Louisiana, 419 U.S. 522, 538, 95 S.Ct. 692, 701-02, 42 L.Ed.2d 690 (1975) ("[W]e impose no requirement that petit juries actually chosen must mirror the community and reflect the various distinctive groups in the population"); cf. Batson v. Kentucky, 476 U.S. 79, 84-85, n. 4, 106 S.Ct. 1712, 1716 n. 4, 90 L.Ed.2d 69 (1986) (expressly declining to address "fair-cross-section" challenge to discriminatory use of peremptory challenges).14 The limited scope of the fair-cross-section requirement is a direct and inevitable consequence of the practical impossibility of providing each criminal defendant with a truly "representative" petit jury, see id., at 85-86, n. 6, 106 S.Ct., at 1717, n. 6, a basic truth that the Court of Appeals itself acknowledged for many years prior to its decision in the instant case. See United States v. Childress, 715 F.2d 1313 (CA8 1983) (en banc), cert. denied, 464 U.S. 1063, 104 S.Ct. 744, 79 L.Ed.2d 202 (1984); Pope v. United States, 372 F.2d 710, 725 (CA8 1967) (Blackmun, J.) ("The point at which an accused is entitled to a fair cross-section of the community is when the names are put in the box from which the panels are drawn"), vacated on other grounds, 392 U.S. 651, 88 S.Ct. 2145, 20 L.Ed.2d 1317 (1968). We remain convinced that an extension of the fair-cross-section requirement to petit juries would be unworkable and unsound, and we decline McCree's invitation to adopt such an extension.

But even if we were willing to extend the fair-cross-section requirement to petit juries, we would still reject the Eighth Circuit's conclusion that "death qualification" violates that requirement. The essence of a "fair-cross-section" claim is the systematic exclusion of "a 'distinctive' group in the community." Duren, supra, 439 U.S., at 364, 99 S.Ct., at 668. In our view, groups defined solely in terms of shared attitudes that would prevent or substantially impair members of the group from performing one of their duties as jurors, such as the "Witherspoon -excludables" at issue here, are not "distinctive groups" for fair-cross-section purposes.

We have never attempted to precisely define the term "distinctive group," and we do not undertake to do so today. But we think it obvious that the concept of "distinctiveness" must be linked to the purposes of the fair-cross-section requirement. In Taylor, supra, we identified those purposes as (1) "guard[ing] against the exercise of arbitrary power" and ensuring that the "commonsense judgment of the community" will act as "a hedge against the overzealous or mistaken prosecutor," (2) preserving "public confidence in the fairness of the criminal justice system," and (3) implementing our belief that "sharing in the administration of justice is a phase of civic responsibility." Id., 419 U.S., at 530-531, 95 S.Ct., at 697-98.

Our prior jury-representativeness cases, whether based on the fair-cross-section component of the Sixth Amendment or the Equal Protection Clause of the Fourteenth Amendment, have involved such groups as blacks, see Peters v. Kiff, 407 U.S. 493, 92 S.Ct. 2163, 33 L.Ed.2d 83 (1972) (equal protection); women, see Duren, supra (fair cross section); Taylor, supra (same); and Mexican-Americans, see Castaneda v. Partida, 430 U.S. 482, 97 S.Ct. 1272, 51 L.Ed.2d 498 (1977) (equal protection). The wholesale exclusion of these large groups from jury service clearly contravened all three of the aforementioned purposes of the fair-cross-section requirement. Because these groups were excluded for reasons completely unrelated to the ability of members of the group to serve as jurors in a particular case, the exclusion raised at least the possibility that the composition of juries would be arbitrarily skewed in such a way as to deny criminal defendants the benefit of the common-sense judgment of the community. In addition, the exclusion from jury service of large groups of individuals not on the basis of their inability to serve as jurors, but on the basis of some immutable characteristic such as race, gender, or ethnic background, undeniably gave rise to an "appearance of unfairness." Finally, such exclusion improperly deprived members of these often historically disadvantaged groups of their right as citizens to serve on juries in criminal cases.

The group of "Witherspoon -excludables" involved in the case at bar differs significantly from the groups we have previously recognized as "distinctive." "Death qualification," unlike the wholesale exclusion of blacks, women, or Mexican-Americans from jury service, is carefully designed to serve the State's concededly legitimate interest in obtaining a single jury that can properly and impartially apply the law to the facts of the case at both the guilt and sentencing phases of a capital trial.15 There is very little danger, therefore, and McCree does not even argue, that "death qualification" was instituted as a means for the State to arbitrarily skew the composition of capital-case juries.16

Furthermore, unlike blacks, women, and Mexican-Americans, "Witherspoon -excludables" are singled out for exclusion in capital cases on the basis of an attribute that is within the individual's control. It is important to remember that not all who oppose the death penalty are subject to removal for cause in capital cases; those who firmly believe that the death penalty is unjust may nevertheless serve as jurors in capital cases so long as they state clearly that they are willing to temporarily set aside their own beliefs in deference to the rule of law. Because the group of "Witherspoon -excludables" includes only those who cannot and will not conscientiously obey the law with respect to one of the issues in a capital case, "death qualification" hardly can be said to create an "appearance of unfairness."

Finally, the removal for cause of "Witherspoon -excludables" in capital cases does not prevent them from serving as jurors in other criminal cases, and thus leads to no substantial deprivation of their basic rights of citizenship. They are treated no differently than any juror who expresses the view that he would be unable to follow the law in a particular case.

In sum, "Witherspoon -excludables," or for that matter any other group defined solely in terms of shared attitudes that render members of the group unable to serve as jurors in a particular case, may be excluded from jury service without contravening any of the basic objectives of the fair-cross-section requirement. See Lockett v. Ohio, 438 U.S. 586, 597, 98 S.Ct. 2954, 2961, 57 L.Ed.2d 973 (1978) ("Nothing in Taylor, however, suggests that the right to a representative jury includes the right to be tried by jurors who have explicitly indicated an inability to follow the law and instructions of the trial judge"). It is for this reason that we conclude that "Witherspoon -excludables" do not constitute a "distinctive group" for fair-cross-section purposes, and hold that "death qualification" does not violate the fair-cross-section requirement.

McCree argues that, even if we reject the Eighth Circuit's fair-cross-section holding, we should affirm the judgment below on the alternative ground, adopted by the District Court, that "death qualification" violated his constitutional right to an impartial jury. McCree concedes that the individual jurors who served at his trial were impartial, as that term was defined by this Court in cases such as Irvin v. Dowd, 366 U.S. 717, 723, 81 S.Ct. 1639, 1643, 6 L.Ed.2d 751 (1961) ("It is sufficient if the juror can lay aside his impression or opinion and render a verdict based on the evidence presented in court"), and Reynolds v. United States, 98 U.S. (8 Otto) 145, 25 L.Ed. 244 (1879). He does not claim that pretrial publicity, see Rideau v. Louisiana, 373 U.S. 723, 83 S.Ct. 1417, 10 L.Ed.2d 663 (1963), ex parte communications, see Remmer v. United States, 347 U.S. 227, 74 S.Ct. 450, 98 L.Ed. 654 (1954), or other undue influence, see Estes v. Texas, 381 U.S. 532, 85 S.Ct. 1628, 14 L.Ed.2d 543 (1965), affected the jury's deliberations. In short, McCree does not claim that his conviction was tainted by any of the kinds of jury bias or partiality that we have previously recognized as violative of the Constitution. Instead, McCree argues that his jury lacked impartiality because the absence of "Witherspoon -excludables" "slanted" the jury in favor of conviction.

We do not agree. McCree's "impartiality" argument apparently is based on the theory that, because all individual jurors are to some extent predisposed towards one result or another, a constitutionally impartial jury can be constructed only by "balancing" the various predispositions of the individual jurors. Thus, according to McCree, when the State "tips the scales" by excluding prospective jurors with a particular viewpoint, an impermissibly partial jury results. We have consistently rejected this view of jury impartiality, including as recently as last Term when we squarely held that an impartial jury consists of nothing more than "jurors who will conscientiously apply the law and find the facts." Wainwright v. Witt, 469 U.S. 412, 423, 105 S.Ct. 844, 852, 83 L.Ed.2d 841 (1985) (emphasis added); see also Smith v. Phillips, 455 U.S. 209, 217, 102 S.Ct. 940, 946, 71 L.Ed.2d 78 (1982) ("Due process means a jury capable and willing to decide the case solely on the evidence before it"); Irvin v. Dowd, supra, 366 U.S., at 722, 81 S.Ct., at 1642 ("In essence, the right to jury trial guarantees to the criminally accused a fair trial by a panel of impartial, 'indifferent' jurors").

The view of jury impartiality urged upon us by McCree is both illogical and hopelessly impractical. McCree characterizes the jury that convicted him as "slanted" by the process of "death qualification." But McCree admits that exactly the same 12 individuals could have ended up on his jury through the "luck of the draw," without in any way violating the constitutional guarantee of impartiality. Even accepting McCree's position that we should focus on the jury rather than the individual jurors, it is hard for us to understand the logic of the argument that a given jury is unconstitutionally partial when it results from a state-ordained process, yet impartial when exactly the same jury results from mere chance. On a more practical level, if it were true that the Constitution required a certain mix of individual viewpoints on the jury, then trial judges would be required to undertake the Sisyphean task of "balancing" juries, making sure that each contains the proper number of Democrats and Republicans, young persons and old persons, white-collar executives and blue-collar laborers, and so on. Adopting McCree's concept of jury impartiality would also likely require the elimination of peremptory challenges, which are commonly used by both the State and the defendant to attempt to produce a jury favorable to the challenger.

McCree argues, however, that this Court's decisions in Witherspoon and Adams v. Texas, 448 U.S. 38, 100 S.Ct. 2521, 65 L.Ed.2d 581 (1980), stand for the proposition that a State violates the Constitution whenever it "slants" the jury by excluding a group of individuals more likely than the population at large to favor the criminal defendant. We think McCree overlooks two fundamental differences between Witherspoon and Adams and the instant case, and therefore misconceives the import and scope of those two decisions.

First, the Court in Witherspoon viewed the Illinois system as having been deliberately slanted for the purpose of making the imposition of the death penalty more likely. The Court said:

"But when it swept from the jury all who expressed conscientious or religious scruples against capital punishment and all who opposed it in principle, the State crossed the line of neutrality. In its quest for a jury capable of imposing the death penalty, the State produced a jury uncommonly willing to condemn a man to die.

"It is, of course, settled that a State may not entrust the determination of whether a man is innocent or guilty to a tribunal 'organized to convict.' Fay v. New York, 332 U.S. 261, 294 [67 S.Ct. 1613, 1630, 91 L.Ed. 2043] [1947]. See Tumey v. Ohio, 273 U.S. 510 [47 S.Ct. 437, 71 L.Ed. 749] [1927]. It requires but a short step from that principle to hold, as we do today, that a State may not entrust the determination of whether a man should live or die to a tribunal organized to return a verdict of death." 391 U.S., at 520-521, 88 S.Ct., at 1776 (footnotes omitted).

In Adams v. Texas, supra, the Court explained the rationale for Witherspoon as follows:

"In this context, the Court held that a State may not constitutionally execute a death sentence imposed by a jury culled of all those who revealed during voir dire examination that they had conscientious scruples against or were otherwise opposed to capital punishment. The State was held to have no valid interest in such a broad-based rule of exclusion, since '[a] man who opposes the death penalty, no less than one who favors it, can make the discretionary judgment entrusted to him . . . and can thus obey the oath he takes as a juror.' Witherspoon v. Illinois, 391 U.S., at 519 [88 S.Ct., at 1775]." 448 U.S., at 43, 100 S.Ct., at 2525.

Adams, in turn, involved a fairly straightforward application of the Witherspoon rule to the Texas capital punishment scheme. See Adams, supra, 448 U.S., at 48, 100 S.Ct., at 2528 (Texas exclusion statute "focuses the inquiry directly on the prospective juror's beliefs about the death penalty, and hence clearly falls within the scope of the Witherspoon doctrine").

Here, on the other hand, the removal for cause of "Witherspoon -excludables" serves the State's entirely proper interest in obtaining a single jury that could impartially decide all of the issues in McCree's case. Arkansas by legislative enactment and judicial decision provides for the use of a unitary jury in capital cases. See Ark.Stat.Ann. § 41-1301(3) (1977); Rector v. State, 280 Ark. 385, 395, 659 S.W.2d 168, 173 (1983), cert. denied, 466 U.S. 988, 104 S.Ct. 2370, 80 L.Ed.2d 842 (1984). We have upheld against constitutional attack the Georgia capital sentencing plan which provided that the same jury must sit in both phases of a bifurcated capital murder trial, Gregg v. Georgia, 428 U.S. 153, 158, 160, 163, 96 S.Ct. 2909, 2918-2920, 49 L.Ed.2d 859 (1976) (opinion of Stewart, POWELL, and STEVENS, JJ.), and since then have observed that we are "unwilling to say that there is any one right way for a State to set up its capital sentencing scheme." Spaziano v. Florida, 468 U.S. 447, 464, 104 S.Ct. 3154, 3165, 82 L.Ed.2d 340 (1984).

The Arkansas Supreme Court recently explained the State's legislative choice to require unitary juries in capital cases:

"It has always been the law in Arkansas, except when the punishment is mandatory, that the same jurors who have the responsibility for determining guilt or innocence must also shoulder the burden of fixing the punishment. That is as it should be, for the two questions are necessarily interwoven." Rector, supra, 280 Ark., at 395, 659 S.W.2d, at 173.

Another interest identified by the State in support of its system of unitary juries is the possibility that, in at least some capital cases, the defendant might benefit at the sentencing phase of the trial from the jury's "residual doubts" about the evidence presented at the guilt phase. The dissenting opinion in the Court of Appeals also adverted to this interest:

"[A]s several courts have observed, jurors who decide both guilt and penalty are likely to form residual doubts or 'whimsical' doubts . . . about the evidence so as to bend them to decide against the death penalty. Such residual doubt has been recognized as an extremely effective argument for defendants in capital cases. To divide the responsibility . . . to some degree would eliminate the influence of such doubts." 758 F.2d, at 247-248 (J. Gibson, J., dissenting) (citations omitted).

Justice MARSHALL's dissent points out that some States which adhere to the unitary jury system do not allow the defendant to argue "residual doubts" to the jury at sentencing. But while this may justify skepticism as to the extent to which such States are willing to go to allow defendants to capitalize on "residual doubts," it does not wholly vitiate the claimed interest. Finally, it seems obvious to us that in most, if not all, capital cases much of the evidence adduced at the guilt phase of the trial will also have a bearing on the penalty phase; if two different juries were to be required, such testimony would have to be presented twice, once to each jury. As the Arkansas Supreme Court has noted, "[s]uch repetitive trials could not be consistently fair to the State and perhaps not even to the accused." Rector, supra, 280 Ark., at 396, 659 S.W.2d, at 173.

Unlike the Illinois system criticized by the Court in Witherspoon, and the Texas system at issue in Adams, the Arkansas system excludes from the jury only those who may properly be excluded from the penalty phase of the deliberations under Witherspoon, Adams and Wainwright v. Witt, 469 U.S. 412, 105 S.Ct. 844, 83 L.Ed.2d 841 (1985).17 That State's reasons for adhering to its preference for a single jury to decide both the guilt and penalty phases of a capital trial are sufficient to negate the inference which the Court drew in Witherspoon concerning the lack of any neutral justification for the Illinois rule on jury challenges.

Second, and more importantly, both Witherspoon and Adams dealt with the special context of capital sentencing, where the range of jury discretion necessarily gave rise to far greater concern over the possible effects of an "imbalanced" jury. As we emphasized in Witherspoon:

"[I]n Illinois, as in other States, the jury is given broad discretion to decide whether or not death is 'the proper penalty' in a given case, and a juror's general views about capital punishment play an inevitable role in any such decision.

". . . . Guided by neither rule nor standard, 'free to select or reject as it [sees] fit,' a jury that must choose between life imprisonment and capital punishment can do little more—and must do nothing less—than express the conscience of the community on the ultimate question of life or death." 391 U.S., at 519, 88 S.Ct., at 1775 (emphasis in original; footnotes omitted).

Because capital sentencing under the Illinois statute involved such an exercise of essentially unfettered discretion, we held that the State violated the Constitution when it "crossed the line of neutrality" and "produced a jury uncommonly willing to condemn a man to die." Id., at 520-521, 88 S.Ct., at 1776.

In Adams, we applied the same basic reasoning to the Texas capital sentencing scheme, which, although purporting to limit the jury's role to answering several "factual" questions, in reality vested the jury with considerable discretion over the punishment to be imposed on the defendant. See 448 U.S., at 46, 100 S.Ct., at 2527 ("This process is not an exact science, and the jurors under the Texas bifurcated procedure unavoidably exercise a range of judgment and discretion while remaining true to their instructions and their oaths"); cf. Jurek v. Texas, 428 U.S. 262, 273, 96 S.Ct. 2950, 2957, 49 L.Ed.2d 929 (1976) (opinion of Stewart, POWELL, and STEVENS, JJ.) ("Texas law essentially requires that . . . in considering whether to impose a death sentence the jury may be asked to consider whatever evidence of mitigating circumstances the defense can bring before it"). Again, as in Witherspoon, the discretionary nature of the jury's task led us to conclude that the State could not "exclude all jurors who would be in the slightest way affected by the prospect of the death penalty or by their views about such a penalty." Adams, 448 U.S., at 50, 100 S.Ct., at 2529.

In the case at bar, by contrast, we deal not with capital sentencing, but with the jury's more traditional role of finding the facts and determining the guilt or innocence of a criminal defendant, where jury discretion is more channeled. We reject McCree's suggestion that Witherspoon and Adams have broad applicability outside the special context of capital sentencing,18 and conclude that those two decisions do not support the result reached by the Eighth Circuit here.

In our view, it is simply not possible to define jury impartiality, for constitutional purposes, by reference to some hypothetical mix of individual viewpoints. Prospective jurors come from many different backgrounds, and have many different attitudes and predispositions. But the Constitution presupposes that a jury selected from a fair cross section of the community is impartial, regardless of the mix of individual viewpoints actually represented on the jury, so long as the jurors can conscientiously and properly carry out their sworn duty to apply the law to the facts of the particular case. We hold that McCree's jury satisfied both aspects of this constitutional standard. The judgment of the Court of Appeals is therefore

Reversed.

Justice BLACKMUN concurs in the result.

Justice MARSHALL, with whom Justice BRENNAN and Justice STEVENS join, dissenting.

Eighteen years ago, this Court vacated the sentence of a defendant from whose jury the State had excluded all venirepersons expressing any scruples against capital punishment. Such a practice, the Court held, violated the Constitution by creating a "tribunal organized to return a verdict of death." Witherspoon v. Illinois, 391 U.S. 510, 521, 88 S.Ct. 1770, 1776, 20 L.Ed.2d 776 (1968). The only venirepersons who could be constitutionally excluded from service in capital cases were those who "made unmistakably clear . . . that they would automatically vote against the imposition of capital punishment" or that they could not assess the defendant's guilt impartially. Id., at 522-523, n. 21, 88 S.Ct., at 1777, n. 21.

Respondent contends here that the "death-qualified" jury that convicted him, from which the State, as authorized by Witherspoon, had excluded all venirepersons unwilling to consider imposing the death penalty, was in effect "organized to return a verdict" of guilty. In support of this claim, he has presented overwhelming evidence that death-qualified juries are substantially more likely to convict or to convict on more serious charges than juries on which unalterable opponents of capital punishment are permitted to serve. Respondent does not challenge the application of Witherspoon to the jury in the sentencing stage of bifurcated capital cases. Neither does he demand that individuals unable to assess culpability impartially ("nullifiers") be permitted to sit on capital juries. All he asks is the chance to have his guilt or innocence determined by a jury like those that sit in noncapital cases—one whose composition has not been tilted in favor of the prosecution by the exclusion of a group of prospective jurors uncommonly aware of an accused's constitutional rights but quite capable of determining his culpability without favor or bias.

With a glib nonchalance ill suited to the gravity of the issue presented and the power of respondent's claims, the Court upholds a practice that allows the State a special advantage in those prosecutions where the charges are the most serious and the possible punishments, the most severe. The State's mere announcement that it intends to seek the death penalty if the defendant is found guilty of a capital offense will, under today's decision, give the prosecution license to empanel a jury especially likely to return that very verdict. Because I believe that such a blatant disregard for the rights of a capital defendant offends logic, fairness, and the Constitution, I dissent.

* Respondent is not the first to argue that "death qualification" poses a substantial threat to the ability of a capital defendant to receive a fair trial on the issue of his guilt or innocence. In 1961, one scholar observed that "Jurors hesitant to levy the death penalty would . . . seem more prone to resolve the many doubts as to guilt or innocence in the defendant's favor than would jurors qualified on the 'pound of flesh' approach." Oberer, Does Disqualification of Jurors for Scruples Against Capital Punishment Constitute Denial of Fair Trial on Issue of Guilt?, 39 Texas L.Rev. 545, 549 (1961).

When he claimed that the exclusion of scrupled jurors from his venire had violated his constitutional right to an impartial jury, the petitioner in Witherspoon v. Illinois, supra, sought to provide empirical evidence to corroborate Oberer's intuition. See Brief for Petitioner in Witherspoon v. Illinois, O.T.1967, No. 1015, pp. 28-33. The data on this issue, however, consisted of only three studies and one preliminary summary of a study.1 Although the data certainly supported the validity of Witherspoon's challenge to his conviction, these studies did not provide the Court with the firmest basis for constitutional adjudication. As a result, while it reversed Witherspoon's death sentence, the Court was unable to conclude that "the exclusion of jurors opposed to capital punishment results in an unrepresentative jury on the issue of guilt or substantially increases the risk of conviction," 391 U.S., at 518, 88 S.Ct., at 1775, and declined to reverse Witherspoon's conviction. Nonetheless, the Court was careful to note

"[A] defendant convicted by [a properly death-qualified] jury in some future case might still attempt to establish that the jury was less than neutral with respect to guilt. If he were to succeed in that effort, the question would then arise whether the State's interest in submitting the penalty issue to a jury capable of imposing capital punishment may be vindicated at the expense of the defendant's interest in a completely fair determination of guilt or innocence—given the possibility of accommodating both interests by means of a bifurcated trial, using one jury to decide guilt and another to fix punishment. That problem is not presented here, however, and we intimate no view as to its proper resolution." Id., at 520, n. 18, 88 S.Ct., at 1776, n. 18.

In the wake of Witherspoon, a number of researchers set out to supplement the data that the Court had found inadequate in that case. The results of these studies were exhaustively analyzed by the District Court in this case, see 569 F.Supp. 1273, 1291-1308 (ED Ark.1983), and can be only briefly summarized here.2 The data strongly suggest that death qualification excludes a significantly large subset—at least 11% to 17%—of potential jurors who could be impartial during the guilt phase of trial.3 Among the members of this excludable class are a disproportionate number of blacks and women. See id., at 1283, 1293-1294.

The perspectives on the criminal justice system of jurors who survive death qualification are systematically different from those of the excluded jurors. Death-qualified jurors are, for example, more likely to believe that a defendant's failure to testify is indicative of his guilt, more hostile to the insanity defense, more mistrustful of defense attorneys, and less concerned about the danger of erroneous convictions. Id., at 1283, 1293, 1304. This proprosecution bias is reflected in the greater readiness of death-qualified jurors to convict or to convict on more serious charges. Id., at 1294-1302; Grigsby v. Mabry, 758 F.2d 226, 233-236 (CA8 1985). And, finally, the very process of death qualification—which focuses attention on the death penalty before the trial has even begun—has been found to predispose the jurors that survive it to believe that the defendant is guilty. 569 F.Supp., at 1302-1305; 758 F.2d, at 234.

The evidence thus confirms, and is itself corroborated by, the more intuitive judgments of scholars and of so many of the participants in capital trials—judges, defense attorneys, and prosecutors. See 569 F.Supp., at 1322.4

Respondent's case would of course be even stronger were he able to produce data showing the prejudicial effects of death qualification upon actual trials. Yet, until a State permits two separate juries to deliberate on the same capital case and return simultaneous verdicts, defendants claiming prejudice from death qualification should not be denied recourse to the only available means of proving their case, recreations of the voir dire and trial processes. See Grigsby v. Mabry, supra, at 237 ("[I]t is the courts who have often stood in the way of surveys involving real jurors and we should not now reject a study because of this deficiency").

The chief strength of respondent's evidence lies in the essential unanimity of the results obtained by researchers using diverse subjects and varied methodologies. Even the Court's haphazard jabs cannot obscure the power of the array. Where studies have identified and corrected apparent flaws in prior investigations, the results of the subsequent work have only corroborated the conclusions drawn in the earlier efforts. Thus, for example, some studies might be faulted for failing to distinguish within the class of Witherspoon -excludables, between nullifiers (whom respondent concedes may be excluded from the guilt phase) and those who could assess guilt impartially. Yet their results are entirely consistent with those obtained after nullifiers had indeed been excluded. See, e.g., Cowan, Thompson, & Ellsworth, The Effects of Death Qualification on Jurors' Predisposition to Convict and on the Quality of Deliberation, 8 Law & Hum. Behav. 53 (1984). And despite the failure of certain studies to "allow for group deliberations," ante, at 171, n. 10, the value of their results is underscored by the discovery that initial verdict preferences, made prior to group deliberations, are a fair predictor of how a juror will vote when faced with opposition in the jury room. See Cowan, Thompson, & Ellsworth, supra, at 68-69; see also R. Hastie, S. Penrod, & N. Pennington, Inside the Jury 66 (1983); H. Kalven & H. Zeisel, The American Jury 488 (1966).

The evidence adduced by respondent is quite different from the "tentative and fragmentary" presentation that failed to move this Court in Witherspoon. 391 U.S., at 517, 88 S.Ct., at 1774. Moreover, in contrast to Witherspoon, the record in this case shows respondent's case to have been 'subjected to the traditional testing mechanisms of the adversary process,' Ballew v. Georgia, 435 U.S. 223, 246, 98 S.Ct. 1029, 1042, 55 L.Ed.2d 334 (1978) (POWELL, J., concurring in judgment). At trial, respondent presented three expert witnesses and one lay witness in his rebuttal. Testimony by these witnesses permitted the District Court, and allows this Court, better to understand the methodologies used here and their limitations. Further testing of respondent's impirical case came at the hands of the State's own expert witnesses. Yet even after considering the evidence aduced by the State, the Court of Appeals properly noted: 'there are no studies which contradict the studies submitted [respondent]; in other words, all of the documented studies support the district court's findings.' 758 F.2d, at 238.

The true impact of death qualification on the fairness of a trial is likely even more devastating than the studies show. Witherspoon placed limits on the State's ability to strike scrupled jurors for cause, unless they state "unambiguously that [they] would automatically vote against the imposition of capital punishment no matter what the trial might reveal," 391 U.S., at 516, n. 9, 88 S.Ct., at 1773-1774, n. 9. It said nothing, however, about the prosecution's use of peremptory challenges to eliminate jurors who do not meet that standard and would otherwise survive death qualification. See Gillers, Deciding Who Dies, 129 U.Pa.L.Rev. 1, 85, n. 391 (1980). There is no question that peremptories have indeed been used to this end, thereby expanding the class of scrupled jurors excluded as a result of the death-qualifying voir dire challenged here. See, e.g., People v. Velasquez, 26 Cal.3d 425, 438, n. 9, 162 Cal.Rptr. 306, 313, n. 9, 606 P.2d 341, 348, n. 9 (1980) (prosecutor informed court during voir dire that if a venireperson expressing scruples about the death penalty "were not a challenge for cause, I would kick her off on a peremptory challenge"). The only study of this practice has concluded: "For the five-year period studied a prima facie case has been demonstrated that prosecutors in Florida's Fourth Judicial Circuit systematically used their peremptory challenges to eliminate from capital juries venirepersons expressing opposition to the death penalty." Winick, Prosecutorial Peremptory Challenge Practices in Capital Cases: An Empirical Study and a Constitutional Analysis, 81 Mich.L.Rev. 1, 39 (1982).5

Judicial applications of the Witherspoon standard have also expanded the class of jurors excludable for cause. While the studies produced by respondent generally classified a subject as a Witherspoon -excludable only upon his unambiguous refusal to vote death under any circumstance, the courts have never been so fastidious. Trial and appellate courts have frequently excluded jurors even in the absence of unambiguous expressions of their absolute opposition to capital punishment. Schnapper, Taking Witherspoon Seriously: The Search for Death-Qualified Jurors, 62 Texas L.Rev. 977, 993-1032 (1984). And this less demanding approach will surely become more common in the wake of this Court's decision in Wainwright v. Witt, 469 U.S. 412, 105 S.Ct. 844, 83 L.Ed.2d 841 (1985). Under Witt, a juror who does not make his attitude toward capital punishment "unmistakably clear," Witherspoon, 391 U.S., at 522, n. 21, 88 S.Ct., at 1777 n. 21, may nonetheless be excluded for cause if the trial court is left with the impression that his attitude will " 'prevent or substantially impair the performance of his duties as a juror in accordance with his instructions and his oath.' " Witt, supra, at 433, 105 S.Ct., at 852 (quoting Adams v. Texas, 448 U.S. 38, 45, 100 S.Ct. 2521, 2526, 65 L.Ed.2d 581 (1980)). It thus "seems likely that Witt will lead to more conviction-prone panels" since " 'scrupled' jurors—those who generally oppose the death penalty but do not express an unequivocal refusal to impose it—usually share the pro-defendant perspective of excludable jurors." See Finch & Ferraro, The Empirical Challenge to Death Qualified Juries: On Further Examination, 65 Neb.L.Rev. 21, 63 (1986).

Faced with the near unanimity of authority supporting respondent's claim that death qualification gives the prosecution a particular advantage in the guilt phase of capital trials, the majority here makes but a weak effort to contest that proposition. Instead, it merely assumes for the purposes of this opinion "that 'death qualification' in fact produces juries somewhat more 'conviction-prone' than 'non-death-qualified' juries," ante, at 173, and then holds that this result does not offend the Constitution. This disregard for the clear import of the evidence tragically misconstrues the settled constitutional principles that guarantee a defendant the right to to a fair trial and an impartial jury whose composition is not biased toward the prosecution.

In Witherspoon, the Court observed that a defendant convicted by a jury from which those unalterably opposed to the death penalty had been excluded "might still attempt to establish that the jury was less than neutral with respect to guilt." 391 U.S., at 520, n. 18, 88 S.Ct., at 1776, n. 18. Respondent has done just that. And I believe he has succeeded in proving that his trial by a jury so constituted violated his right to an impartial jury, guaranteed by both the Sixth Amendment and principles of due process, see Ristaino v. Ross, 424 U.S. 589, 595, n. 6, 96 S.Ct. 1017, 1020, n. 6, 47 L.Ed.2d 258 (1976). We therefore need not rely on respondent's alternative argument that death qualification deprived him of a jury representing a fair cross section of the community.6

Respondent does not claim that any individual on the jury that convicted him fell short of the constitutional standard for impartiality. Rather, he contends that, by systematically excluding a class of potential jurors less prone than the population at large to vote for conviction, the State gave itself an unconstitutional advantage at his trial. Thus, according to respondent, even though a nonbiased selection procedure might have left him with a jury composed of the very same individuals that actually sat on his panel, the process by which those 12 individuals were chosen violated the Constitution.

I am puzzled by the difficulty that the majority has in understanding the "logic of the argument." Ante, at 178. For the logic is precisely that which carried the day in Witherspoon, and which has never been repudiated by this Court—not even today, if the majority is to be taken at its word. There was no question in Witherspoon that if the defendant's jury had been chosen by the "luck of the draw," the same 12 jurors who actually sat on his case might have been selected. Nonetheless, because the State had removed from the pool of possible jurors all those expressing general opposition to the death penalty, the Court overturned the defendant's conviction, declaring "that a State may not entrust the determination of whether a man should live or die to a tribunal organized to return a verdict of death." 391 U.S., at 521, 88 S.Ct., at 1776. Witherspoon had been denied a fair sentencing determination, the Court reasoned, not because any member of his jury lacked the requisite constitutional impartiality, but because the manner in which that jury had been selected "stacked the deck" against him. Id., at 523, 88 S.Ct., at 1778. Here, respondent adopts the approach of the Witherspoon Court and argues simply that the State entrusted the determination of his guilt and the level of his culpability to a tribunal organized to convict.

The Court offers but two arguments to rebut respondent's constitutional claim. First, it asserts that the "State's reasons for adhering to its preference for a single jury to decide both the guilt and penalty phases of a capital trial are sufficient to negate the inference which the Court drew in Witherspoon concerning the lack of any neutral justification for the Illinois rule on jury challenges." Ante, at 182. This argument, however, does not address the question whether death qualification infringes a defendant's constitutional interest in "a completely fair determination of guilt or innocence," Witherspoon, 391 U.S., at 520, n. 18, 88 S.Ct., at 1776, n. 18. It merely indicates the state interest that must be considered once an infringement of that constitutional interest is found.

The Court's second reason for rejecting respondent's challenge to the process that produced his jury is that the notion of "neutrality" adumbrated in Witherspoon must be confined to "the special context of capital sentencing, where the range of jury discretion necessarily gave rise to far greater concern over the possible effects of an 'imbalanced' jury." Ante, at 182. But in the wake of this Court's decision in Adams v. Texas, 448 U.S. 38, 100 S.Ct. 2521, 65 L.Ed.2d 581 (1980), this distinction is simply untenable.

In Adams, this Court applied the principles of Witherspoon to the Texas death-penalty scheme. Under that scheme, if a defendant is convicted of a capital offense, a separate sentencing proceeding is held at which additional aggravating or mitigating evidence is admissible. The jury then must answer three questions based on evidence adduced during either phase of the trial:

"(1) whether the conduct of the defendant that caused the death of the deceased was committed deliberately and with the reasonable expectation that the death of the deceased or another would result;

"(2) whether there is a probability that the defendant would commit criminal acts of violence that would constitute a continuing threat to society; and

"(3) if raised by the evidence, whether the conduct of the defendant in killing the deceased was unreasonable in reponse to the provocation, if any, by the deceased." Tex.Code Crim.Proc.Ann., Art. 37.071(b) (Vernon Supp.1986).

See Adams, supra, at 40-41, 100 S.Ct., at 2524-2525. If the jury finds beyond a reasonable doubt that the answer to each of these questions is "yes," the court must impose a death sentence; a single "no" answer requires the court to impose a sentence of life imprisonment. With the role of the jury so defined, Adams held that Texas could not constitutionally exclude every prospective juror unable to state under oath that "the mandatory penalty of death or imprisonment for life will not affect his deliberations on any issue of fact." Tex.Penal Code Ann. § 12.31(b) (1974); see Adams, supra, at 42, 100 S.Ct., at 2525. The "process" of answering the statutory questions, the Court observed, "is not an exact science, and the jurors under the Texas bifurcated procedure unavoidably exercise a range of judgment and discretion while remaining true to their instructions and their oaths." 448 U.S., at 46, 100 S.Ct., at 2527. Consequently, while Texas could constitutionally exclude jurors whose scruples against the death penalty left them unable "to answer the statutory questions without conscious distortion or bias," ibid., it could not exclude those

"[who] aver that they will honestly find the facts and answer the questions in the affirmative if they are convinced beyond reasonable doubt, but not otherwise, yet who frankly concede that the prospects of the death penalty may affect what their honest judgment of the facts will be or what they may deem to be a reasonable doubt. Such assessments and judgments by jurors are inherent in the jury system, and to exclude all jurors who would be in the slightest way affected by the prospect of the death penalty or by their views about such a penalty would be to deprive the defendant of the impartial jury to which he or she is entitled under the law." Id., at 50, 100 S.Ct., at 2529.

The message of Adams is thus that even where the role of the jury at the penalty stage of a capital trial is limited to what is essentially a factfinding role, the right to an impartial jury established in Witherspoon bars the State from skewing the composition of its capital juries by excluding scrupled jurors who are nonetheless able to find those facts without distortion or bias. This proposition cannot be limited to the penalty stage of a capital trial, for the services that Adams' jury was called upon to perform at his penalty stage "are nearly indistinguishable" from those required of juries at the culpability phase of capital trials. Gillers, Proving the Prejudice of Death-Qualified Juries after Adams v. Texas, 47 U.Pitt.L.Rev. 219, 247 (1985). Indeed, Justice REHNQUIST noted in Adams that he could "see no plausible distinction between the role of the jury in the guilt/innocence phase of the trial and its role, as defined by the State of Texas, in the sentencing phase." 448 U.S., at 54, 100 S.Ct., at 2531 (dissenting). Contrary to the majority's suggestion, ante at 183, this point was at no time repudiated by the Adams Court. And the absence of a reply to Justice REHNQUIST was not an oversight. At the penalty stage of his trial, Adams' jury may have been called upon to do something more than ascertain the existence vel non of specific historical facts. Yet the role assigned a jury at a trial's culpability phase is little different, for there the critical task of the jury will frequently be to determine not whether defendant actually inflicted the fatal wound, but rather whether his level of culpability at the time of the murder makes conviction on capital murder charges, as opposed to a lesser count, more appropriate. Representing the conscience of the community, the jurors at both stages "unavoidably exercise a range of judgment and discretion while remaining true to their instructions and their oaths." 448 U.S., at 46, 100 S.Ct., at 2527.

Adams thus provides clear precedent for applying the analysis of Witherspoon to the guilt phase of a criminal trial. Indeed, respondent's case is even stronger than Witherspoon's. The Court in Witherspoon merely presumed that the exclusion of scrupled jurors would unacceptably increase the likelihood that the defendant would be condemned to death. Respondent here has gone much further and laid a solid empirical basis to support his claim that the juries produced by death qualification are substantially more likely to convict.

One need not rely on the analysis and assumptions of Adams and Witherspoon to demonstrate that the exclusion of opponents of capital punishment capable of impartially determining culpability infringes a capital defendant's constitutional right to a fair and impartial jury. For the same conclusion is compelled by the analysis that in Ballew v. Georgia, 435 U.S. 223, 98 S.Ct. 1029, 55 L.Ed.2d 234 (1978), led a majority of this Court7 to hold that a criminal conviction rendered by a five-person jury violates the Sixth and Fourteenth Amendments.

Faced with an effort by Georgia to reduce the size of the jury in a criminal case beyond the six-member jury approved by this Court in Williams v. Florida, 399 U.S. 78, 90 S.Ct. 1893, 26 L.Ed.2d 446 (1970), this Court articulated several facets of the inquiry whether the reduction impermissibly "inhibit[ed] the functioning of the jury as an institution to a significant degree." Ballew, supra, 435 U.S., at 231, 98 S.Ct., at 1034. First, the Court noted that "recent empirical data" had suggested that a five-member jury was "less likely to foster effective group deliberation" and that such a decline in effectiveness would likely lead "to inaccurate factfinding and incorrect application of the common sense of the community to the facts." Id., at 232, 98 S.Ct., at 1035. The Court advanced several explanations for this phenomenon:

"As juries decrease in size . . ., they are less likely to have members who remember each of the important pieces of evidence or argument. Furthermore, the smaller the group, the less likely it is to overcome the biases of its members to obtain an accurate result. When individual and group decisionmaking were compared, it was seen that groups performed better because prejudices of individuals were frequently counterbalanced, and objectivity resulted." Id., at 233, 98 S.Ct., at 1035 (footnotes omitted).

The Court also cited empirical evidence suggesting "that the verdicts of jury deliberation in criminal cases will vary as juries become smaller, and that the variance amounts to an imbalance to the detriment of one side, the defense." Id., at 236, 98 S.Ct., at 1037. Lastly, the Court observed that further reductions in jury size would also foretell problems "for the representation of minority groups in the community." Ibid.

Each of the concerns that led this Court in Ballew to find that a misdemeanor defendant had been deprived of his constitutional right to a fair trial by jury is implicated by the process of death qualification, which threatens a defendant's interests to an even greater extent in cases where the stakes are substantially higher. When compared to the juries that sit in all other criminal trials, the death-qualified juries of capital cases are likely to be deficient in the quality of their deliberations, the accuracy of their results, the degree to which they are prone to favor the prosecution, and the extent to which they adequately represent minority groups in the community.

The data considered here, as well as plain common sense, leave little doubt that death qualification upsets the "counterbalancing of various biases" among jurors that Ballew identified as being so critical to the effective functioning of juries. Id., at 234, 98 S.Ct., at 1036. The evidence demonstrates that "a person's attitude toward capital punishment is an important indicator of a whole cluster of attitudes about crime control and due process." Fitzgerald & Ellsworth, Due Process vs. Crime Control: Death Qualification and Jury Attitudes, 8 Law & Hum.Behav. 31, 46 (1984). Members of the excluded group have been shown to be significantly more concerned with the constitutional rights of criminal defendants and more likely to doubt the strength of the prosecution's case. No doubt because diversity promotes controversy, which in turn leads to a closer scrutiny of the evidence, one study found that "the members of mixed juries [composed of Witherspoon -excludables as well as death-qualified jurors] remember the evidence better than the members of death-qualified juries." Cowan, Thompson, & Ellsworth, 8 Law & Hum.Behav., at 76. This study found that not only is the recall of evidence by a death-qualified jury likely to be below the standard of ordinary juries, but its testing of that evidence will be less rigorous. Id., at 75. It thus appears that in the most serious criminal cases—those in which the State has expressed an intention to seek the death penalty—the ability of the jury to find historical truth may well be impaired.

The role of a jury in criminal cases, however, is not limited to the determination of historical facts. The task of ascertaining the level of a defendant's culpability requires a jury to decide not only whether the accused committed the acts alleged in the indictment, but also the extent to which he is morally blameworthy. Thus, especially in capital cases, where a defendant invariably will be charged with lesser included offenses having factual predicates similar to those of the capital murder charges, see Beck v. Alabama, 447 U.S. 625, 100 S.Ct. 2382, 65 L.Ed.2d 392 (1980), it may be difficult to classify a particular verdict as "accurate" or "inaccurate." However, the Ballew Court went beyond a concern for simple historical accuracy and questioned any jury procedure that systematically operated to the "detriment of . . . the defense." 435 U.S., at 236, 98 S.Ct., at 1037.

With even more clarity than the data considered in Ballew, the studies adduced by respondent show a broad pattern of "biased decisionmaking," Ballew, supra, at 239, 98 S.Ct., at 1039. It is not merely that the jurors who survive death qualification are more likely to accept the word of the prosecution and be satisfied with a lower standard of proof than those who are excluded. The death-qualified jurors are actually more likely to convict than their peers. Whether the verdict against a particular capital defendant will actually be different depends on the strength of the evidence against him, the likelihood that, absent death qualification, one or more Witherspoon -excludables would have sat on his jury, and a host of other factors. See Gillers, 47 U.Pitt.L.Rev., at 232-238. However, Ballew points to the importance of considering the effects of a particular jury procedure over a range of cases, and not focusing on the fairness of any single trial. Because it takes only one juror unwilling to find that the prosecution has met its burden for a trial to end in either a mistrial or a compromise verdict, "it can be confidently asserted that, over time, some persons accused of capital crimes will be convicted of offenses—and to a higher degree—who would not be so convicted" had all persons able to assess their guilt impartially been permitted to sit on their juries. Hovey v. Superior Court, 28 Cal.3d 1, 25, n. 57, 168 Cal.Rptr. 128, 141, n. 57, 616 P.2d 1301, 1314, n. 57 (1980).

Death qualification also implicates the Ballew Court's concern for adequate representation of minority groups. Because opposition to capital punishment is significantly more prevalent among blacks than among whites, the evidence suggests that death qualification will disproportionately affect the representation of blacks on capital juries. Though perhaps this effect may not be sufficient to constitute a violation of the Sixth Amendment's fair-cross-section principle, see Duren v. Missouri, 439 U.S. 357, 363-364, 99 S.Ct. 664, 668, 58 L.Ed.2d 579 (1979), it is similar in magnitude to the reduction in minority representation that the Ballew Court found to be of "constitutional significance" to a defendant's right to a fair jury trial, 435 U.S., at 239, 98 S.Ct., at 1038. See White, Death-Qualified Juries: The "Prosecution Proneness" Argument Reexamined, 41 U.Pitt.L.Rev. 353, 387-389 (1980).

The principle of "impartiality" invoked in Witherspoon is thus not the only basis for assessing whether the exclusion of jurors unwilling to consider the death penalty but able impartially to determine guilt infringes a capital defendant's constitutional interest in a fair trial. By identifying the critical concerns that are subsumed in that interest, the Ballew Court pointed to an alternative approach to the issue, drawing on the very sort of empirical data that respondent has presented here. And viewed in light of the concerns articulated in Ballew, the evidence is sufficient to establish that death qualification constitutes a substantial threat to a defendant's Sixth and Fourteenth Amendment right to a fair jury trial—a threat constitutionally acceptable only if justified by a sufficient state interest.

Respondent's challenge to the impartiality of death-qualified juries focuses upon the imbalance created when jurors particularly likely to look askance at the prosecution's case are systematically excluded from panels. He therefore appears to limit his constitutional claim to only those cases in which jurors have actually been struck for cause because of their opposition to the death penalty. Tr. of Oral Arg. 26. However, this limitation should not blind the Court to prejudice that occurs even in cases in which no juror has in fact been excluded for refusing to consider the death penalty.

There is considerable evidence that the very process of determining whether any potential jurors are excludable for cause under Witherspoon predisposes jurors to convict. One study found that exposure to the voir dire needed for death qualification "increased subjects' belief in the guilt of the defendant and their estimate that he would be convicted." Haney, On the Selection of Capital Juries: The Biasing Effects of the Death-Qualification Process, 8 Law & Hum.Behav. 121, 128 (1984). See Hovey, supra, 28 Cal.3d, at 73, 168 Cal.Rptr., at 176, 616 P.2d, at 1349. Even if this prejudice to the accused does not constitute an independent due process violation, it surely should be taken into account in any inquiry into the effects of death qualification. "[T]he process effect may function additively to worsen the perspective of an already conviction-prone jury whose composition has been distorted by the outcome of this selection process. . . ." Haney, Examining Death Qualification: Further Analysis of the Process Effect, 8 Law & Hum.Behav. 133, 151 (1984).

The majority contends that any prejudice attributed to the process of death-qualifying jurors is justified by the State's interest in identifying and excluding nullifiers before the guilt stage of trial. Ante, at ----, n. 7. It overlooks, however, the ease with which nullifiers could be identified before trial without any extended focus on how jurors would conduct themselves at a capital sentencing proceeding. Potential jurors could be asked, for example, "if there be any reason why any of them could not fairly and impartially try the issue of defendant's guilt in accordance with the evidence presented at the trial and the court's instructions as to the law." Grigsby II, 569 F.Supp., at 1310.8 The prejudice attributable to the current pretrial focus on the death penalty should therefore be considered here and provides but another reason for concluding that death qualification infringes a capital defendant's "interest in a completely fair determination of guilt or innocence." Witherspoon, 391 U.S., at 520, n. 18, 88 S.Ct., at 1776, n. 18.

As the Witherspoon Court recognized, "the State's interest in submitting the penalty issue to a jury capable of imposing capital punishment" may be accommodated without infringing a capital defendant's interest in a fair determination of his guilt if the State uses "one jury to decide guilt and another to fix punishment." Ibid. Any exclusion of death-penalty opponents, the Court reasoned, could await the penalty phase of a trial. The question here is thus whether the State has other interests that require the use of a single jury and demand the subordination of a capital defendant's Sixth and Fourteenth Amendment rights.

The only two reasons that the Court invokes to justify the State's use of a single jury are efficient trial management and concern that a defendant at his sentencing proceedings may be able to profit from "residual doubts" troubling jurors who have sat through the guilt phase of his trial. The first of these purported justifications is merely unconvincing. The second is offensive.

In Ballew, the Court found that the State's interest in saving "court time and . . . financial costs" was insufficient to justify further reductions in jury size. 435 U.S., at 243-244, 98 S.Ct., at 1040-41. The same is true here. The additional costs that would be imposed by a system of separate juries are not particularly high.

"First, capital cases constitute a relatively small number of criminal trials. Moreover, the number of these cases in which a penalty determination will be necessary is even smaller. A penalty determination will occur only where a verdict on guilt has been returned that authorizes the possible imposition of capital punishment, and only where the prosecutor decides that a death sentence should be sought. Even in cases in which a penalty determination will occur, the impaneling of a new penalty jury may not always be necessary. In some cases, it may be possible to have alternate jurors replace any 'automatic life imprisonment' jurors who served at the guilt determination trial." Winick, 81 Mich.L.Rev., at 57.

In a system using separate juries for guilt and penalty phases, time and resources would be saved every time a capital case did not require a penalty phase. The voir dire needed to identify nullifiers before the guilt phase is less extensive than the questioning that under the current scheme is conducted before every capital trial. The State could, of course, choose to empanel a death-qualified jury at the start of every trial, to be used only if a penalty stage is required. However, if it opted for the cheaper alternative of empaneling a death-qualified jury only in the event that a defendant were convicted of capital charges, the State frequently would be able to avoid retrying the entire guilt phase for the benefit of the penalty jury. Stipulated summaries of prior evidence might, for example, save considerable time. Thus, it cannot fairly be said that the costs of accommodating a defendant's constitutional rights under these circumstances are prohibitive, or even significant.

Even less convincing is the Court's concern that a defendant be able to appeal at sentencing to the "residual doubts" of the jurors who found him guilty. Any suggestion that the current system of death qualification "may be in the defendant's best interests, seems specious unless the state is willing to grant the defendant the option to waive this paternalistic protection in exchange for better odds against conviction." Finch & Ferraro, 65 Neb.L.Rev., at 69. Furthermore, this case will stand as one of the few times in which any legitimacy has been given to the power of a convicted capital defendant facing the possibility of a death sentence to argue as a mitigating factor the chance that he might be innocent. Where a defendant's sentence but not his conviction has been set aside on appeal, States have routinely empaneled juries whose only duty is to assess punishment, thereby depriving defendants of the chance to profit from the "residual doubts" that jurors who had already sat through a guilt phase might bring to the sentencing proceeding. In its statute authorizing resentencing without any reassessment of culpability, Arkansas has noted: "it is a waste of judicial resources to require the retrying of an error-free trial if the State wishes to seek to reimpose the death penalty." 1983 Ark.Gen.Act No. 546, § 3, note following Ark.Rev.Stat.Ann. § 41-1358 (Supp.1985).

But most importantly, it ill-behooves the majority to allude to a defendant's power to appeal to "residual doubts" at his sentencing when this Court has consistently refused to grant certiorari in state cases holding that these doubts cannot properly be considered during capital sentencing proceedings. See Burr v. Florida, 474 U.S. 879, 106 S.Ct. 201, 88 L.Ed.2d 170 (1985) (MARSHALL, J., dissenting from denial of certiorari); Heiney v. Florida, 469 U.S. 920, 105 S.Ct. 303, 83 L.Ed.2d 237 (1984) (MARSHALL, J., dissenting from denial of certiorari); Burford v. State, 403 So.2d 943 (Fla.1981), cert. denied, 454 U.S. 1164, 102 S.Ct. 1039, 71 L.Ed.2d 320 (1982). Any suggestion that capital defendants will benefit from a single jury thus is more than disingenuous. It is cruel.

On occasion, this Court has declared what I believe should be obvious—that when a State seeks to convict a defendant of the most serious and severely punished offenses in its criminal code, any procedure that "diminish[es] the reliability of the guilt determination" must be struck down. Beck v. Alabama, 447 U.S., at 638, 100 S.Ct., at 2390. But in spite of such declarations, I cannot help thinking that respondent here would have stood a far better chance of prevailing on his constitutional claims had he not been challenging a procedure peculiar to the administration of the death penalty. For in no other context would a majority of this Court refuse to find any constitutional violation in a state practice that systematically operates to render juries more likely to convict, and to convict on the more serious charges. I dissent.