Missouri
How Atkins v. Virginia applies in Missouri: state-specific rules, key cases, and bar exam notes for Constitutional Law (Eighth Amendment; Criminal Procedure/Death Penalty).
Missouri has adopted the principles from Atkins v. Virginia, which prohibits the execution of individuals with intellectual disabilities. The state assesses intellectual disability through a strict adherence to evaluations and definitions that are consistent with contemporary clinical standards.
In Missouri, individuals must demonstrate significant limitations in intellectual functioning and adaptive behavior to qualify for protection under the Eighth Amendment as interpreted in Atkins.
The Missouri Supreme Court found that the defendant met the criteria for intellectual disability under Atkins and thus could not be sentenced to death.
The court overturned a death sentence, concluding that the defendant's IQ and adaptive functioning were sufficiently impaired to trigger Atkins protections.
The court emphasized the importance of reliable expert testimony to evaluate claims of intellectual disability in capital cases.
Missouri's application of the Atkins standard closely aligns with federal law, adhering to the requirement that states must not execute individuals with severe intellectual disabilities. However, Missouri's courts may impose stricter evidentiary standards in assessing claims of intellectual disability compared to other jurisdictions.
Atkins v. Virginia is often discussed in the context of Eighth Amendment violations related to capital punishment on the Missouri bar exam, particularly under its application to intellectual disability claims.