Which U.S. Supreme Court case ruled that the Eighth Amendment prevents execution of an insane prisoner?

Which U.S. Supreme Court case ruled that the Eighth Amendment prevents execution of an insane prisoner? Ford v. Wainwright.

Ford v. Wainwright, decided June 26, 1986, held that the Eighth Amendment prohibits a state from executing a prisoner who is insane. The case concerned Alvin Bernard Ford, a Florida death-row prisoner whose mental condition deteriorated after his 1974 murder conviction and death sentence.

Florida relied on a brief examination by a governor-appointed panel of three psychiatrists, while other psychiatrists questioned Ford’s competence to be executed. The Supreme Court ruled that Florida’s procedures did not provide adequate assurance of a reliable determination and remanded the case for a proper hearing. The justices were divided over the precise constitutional test and procedures, but the core prohibition against executing the insane was established.

The ruling is commonly confused with Panetti v. Quarterman, which later clarified the constitutional standard and held that a prisoner must have a rational understanding of the reason for execution. Madison v. Alabama concerned a related competency question involving dementia, while Baze v. Rees addressed lethal-injection methods. Ford also differs from the insanity defense: it concerns mental competence at the time of execution, not whether a defendant was legally responsible when committing the crime.