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The Cruel and Unusual Punishments Clause's

Ban on Executing the Intellectually Disabled



May   1, 2026

In 2002, the Supreme Court in Atkins v. Virginia ruled that the imposition of capital punishment on the
intellectually disabled constitutes cruel and unusual punishment in violation of the Eighth Amendment,
leaving to the states the responsibility to determine who qualifies as intellectually disabled. (The Eighth
Amendment  binds both the federal as well as state and local governments by virtue of the Fourteenth
Amendment.)  In and after Atkins, the Court has provided some guideposts to the states in performing this
constitutional inquiry. The Court has not, however, resolved whether and how states may consider a
defendant's scores from multiple Intellectual Quotient (IQ) tests. This term, in Hamm v. Smith, the Court
may resolve the open question.
This Sidebar discusses the Supreme Court's jurisprudence on the Eighth Amendment and the imposition
of capital punishment on the intellectually disabled. It sketches the Supreme Court's specific decisions
applying the Eighth Amendment's Cruel and Unusual Punishments Clause to the subject of executing the
intellectually disabled. Against this backdrop, this Sidebar provides an overview of the Hamm case that
remains pending before the Supreme Court. Finally, this Sidebar closes with considerations for Congress.

The   Categorical Ban on Imposing Capital Punishment on Individuals
with   Intellectual   Disabilities

Atkins  v. Virginia
In 2002, the Supreme Court determined in Atkins v. Virginia that subjecting prisoners with intellectual
disabilities to capital punishment had become truly unusual, and that it was fair to say that a national
consensus had developed against this policy. To wit, in 1989, only two states that otherwise permitted
capital punishment and the federal government prohibited the execution of persons with intellectual
disabilities. By contrast, in 2002, the Court observed, an additional sixteen states that otherwise allowed
capital punishment had prohibited execution of persons with intellectual disabilities, and no states had
reinstated the power. What mattered, the Court clarified, was not so much the number of states that had
changed course, but instead the consistency of the direction of change.


                                                                Congressional Research Service
                                                                https://crsreports.congress.gov
                                                                                    LSB11426

CRS Legal Sidebar
Prepared for Members and
Committees of Congress