406
Opinion of the Court
renders the fact or timing of his execution contingent upon establishment of a further fact," Justice Marshall wrote, "then that fact must be determined with the high regard for truth that befits a decision affecting the life or death of a human being." Id., at 411. Because the Florida scheme for determining the sanity of persons sentenced to death failed "to achieve even the minimal degree of reliability," id., at 413, the plurality concluded that Ford was entitled to an evidentiary hearing on his sanity before the District Court.
Unlike petitioner here, Ford did not challenge the validity of his conviction. Rather, he challenged the constitutionality of his death sentence in view of his claim of insanity. Because Ford's claim went to a matter of punishment—not guilt—it was properly examined within the purview of the Eighth Amendment. Moreover, unlike the question of guilt or innocence, which becomes more uncertain with time for evidentiary reasons, the issue of sanity is properly considered in proximity to the execution. Finally, unlike the sanity determination under the Florida scheme at issue in Ford, the guilt or innocence determination in our system of criminal justice is made "with the high regard for truth that befits a decision affecting the life or death of a human being." Id., at 411.
Petitioner also relies on Johnson v. Mississippi, 486 U. S. 578 (1988), where we held that the Eighth Amendment requires reexamination of a death sentence based in part on a prior felony conviction which was set aside in the rendering State after the capital sentence was imposed. There, the State insisted that it was too late in the day to raise this point. But we pointed out that the Mississippi Supreme Court had previously considered similar claims by writ of error coram nobis. Thus, there was no need to override state law relating to newly discovered evidence in order to consider Johnson's claim on the merits. Here, there is no doubt that petitioner seeks additional process—an evidentiary hearing on his claim of "actual innocence" based on
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