Cite as: 536 U. S. 304 (2002)
Moreover, even in States allowing the execution of mentally retarded offenders, the practice is uncommon. Pp. 313-317.
(c) An independent evaluation of the issue reveals no reason for the Court to disagree with the legislative consensus. Clinical definitions of mental retardation require not only subaverage intellectual functioning, but also significant limitations in adaptive skills. Mentally retarded persons frequently know the difference between right and wrong and are competent to stand trial, but, by definition, they have diminished capacities to understand and process information, to communicate, to abstract from mistakes and learn from experience, to engage in logical reasoning, to control impulses, and to understand others' reactions. Their deficiencies do not warrant an exemption from criminal sanctions, but diminish their personal culpability. In light of these deficiencies, the Court's death penalty jurisprudence provides two reasons to agree with the legislative consensus. First, there is a serious question whether either justification underpinning the death penalty—retribution and deterrence of capital crimes—applies to mentally retarded offenders. As to retribution, the severity of the appropriate punishment necessarily depends on the offender's culpability. If the culpability of the average murderer is insufficient to justify imposition of death, see Godfrey v. Georgia, 446 U. S. 420, 433, the lesser culpability of the mentally retarded offender surely does not merit that form of retribution. As to deterrence, the same cognitive and behavioral impairments that make mentally retarded defendants less morally culpable also make it less likely that they can process the information of the possibility of execution as a penalty and, as a result, control their conduct based upon that information. Nor will exempting the mentally retarded from execution lessen the death penalty's deterrent effect with respect to offenders who are not mentally retarded. Second, mentally retarded defendants in the aggregate face a special risk of wrongful execution because of the possibility that they will unwittingly confess to crimes they did not commit, their lesser ability to give their counsel meaningful assistance, and the facts that they are typically poor witnesses and that their demeanor may create an unwarranted impression of lack of remorse for their crimes. Pp. 317-321.
260 Va. 375, 534 S. E. 2d 312, reversed and remanded.
Stevens, J., delivered the opinion of the Court, in which O'Connor, Kennedy, Souter, Ginsburg, and Breyer, JJ., joined. Rehnquist, C. J., filed a dissenting opinion, in which Scalia and Thomas, JJ., joined, post, p. 321. Scalia, J., filed a dissenting opinion, in which Rehnquist, C. J., and Thomas, J., joined, post, p. 337.
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