:"The Eighth Amendment prohibits a State from car-rying out a sentence of death upon a prisoner who is insane."
:"The Eighth Amendment prohibits a State from car-rying out a sentence of death upon a prisoner who is insane."
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This prohibition applies despite a prisoner's earlier competency to be held responsible for committing a crime and to be tried for it. The Court held that prior findings of competency do not foreclose a prisoner from proving he is incompetent to be executed because of his present mental condition.
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Under this rule, once a prisoner makes the requisite preliminary showing that his current mental state would bar his execution, the [[Eighth Amendment]], applicable to the States under the [[Due Process Clause]] of the [[Fourteenth Amendment]], entitles him to an adjudication to determine his condition.