Penry v. Lynaugh
Facts
At the penalty phase of his Texas capital trial, Penry introduced evidence that he was mentally retarded, had organic brain damage, had the mental age of a young child, had poor impulse control, and had suffered severe childhood abuse. Texas required the jury to answer three special issues concerning deliberateness, future dangerousness, and provocation, and the jury was instructed to consider all the evidence but was not instructed that it could treat Penry's evidence as mitigating and decline to impose death on that basis. The jury answered all special issues yes, which required a death sentence. Penry argued on habeas that the instructions gave the jury no vehicle to give effect to his mitigating evidence and that the Eighth Amendment barred his execution because of his mental retardation.
Issue
Whether, on federal habeas review, Penry's challenge to the Texas capital sentencing instructions sought a new rule barred by Teague, and if not, whether the Eighth Amendment was violated because the jury could not consider and give effect to his mitigating evidence under the Texas special issues. Also, whether the Eighth Amendment categorically prohibits the execution of a mentally retarded offender like Penry.
Rule
A capital sentencer must be permitted to consider and give effect to any relevant mitigating evidence concerning the defendant's background, character, or the circumstances of the offense. In Texas, when mitigating evidence has relevance to moral culpability beyond the scope of the special issues, the jury must, upon request, receive instructions that provide a vehicle for expressing a reasoned moral response to that evidence. A rule requiring that result is not a new rule under Teague because it is dictated by Lockett and Eddings and by the assurances underlying Jurek. However, the Eighth Amendment does not categorically bar execution of mentally retarded offenders where insufficient objective evidence shows a national consensus against that punishment.
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