Which court decision declared executions of severely retarded persons to be "cruel and unusual" and, thus, in violation of the Eighth Amendment?

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The court decision that declared executions of severely retarded persons to be "cruel and unusual" and, thus, in violation of the Eighth Amendment is Atkins v. Virginia (2002). In this case, the US Supreme Court held that execution of intellectually disabled individuals violates the Eighth Amendment's prohibition against cruel and unusual punishment.

Which Court Decision Declared Executions of Severely Retarded Persons to Be