Atkins v. Virginia, 536 U.S. 304 (2002), is a case in which the Supreme Court of the United States ruled 6 - 3 that executing people with intellectual disabilities violates the Eighth Amendment 's ban on cruel and unusual punishments, but states can define who has intellectual disability. Twelve years later in Hall v. Florida the U.S. Supreme Court narrowed the discretion under which U.S. states can designate an individual convicted of murder as too intellectually incapacitated to be executed.
in which case did the united states supreme court bar the execution of the mentally handicapped
Atkins v. Virginia, 536 U.S. 304 (2002)