Hall v. Florida
The Supreme Court struck down Florida's rule that automatically disqualified a death-row inmate from claiming intellectual disability because his IQ test scored 71 instead of 70 or below.
The ruling means states cannot use a rigid IQ cutoff to block death-row prisoners from presenting other evidence of intellectual disability, such as difficulty caring for themselves or functioning in daily life, when their test scores fall within the acknowledged margin of error.
“Florida seeks to execute a man because he scored a 71 instead of 70 on an IQ test.”
Kennedy frames the case as turning on an arbitrarily rigid one-point difference in test scores.
How it got here: A Florida trial court denied Hall's motion under the state's 70-point IQ threshold; the Florida Supreme Court upheld that threshold as constitutional; Hall asked the U.S. Supreme Court to review it.
The Case in Depth
What happened
Freddie Lee Hall was sentenced to death in Florida for the 1978 murders of a pregnant woman and a sheriff's deputy. Extensive testimony from teachers, family, and clinicians described him as severely intellectually impaired since childhood and raised in horrific, abusive conditions. After the Supreme Court barred executing intellectually disabled people in Atkins v. Virginia, Hall sought to prove his disability, but Florida required him to first show an IQ score of 70 or below.
The question before the Court
Can a state require death-row prisoners to prove an IQ score of 70 or below before they're allowed to present any other evidence of intellectual disability?
The Court's answer
No — the Court ruled that Florida could not use a rigid IQ score of 70 as an absolute cutoff for deciding intellectual disability in death-penalty cases. Because IQ tests carry a built-in margin of error, a score of 71 does not reliably rule out a "true" score of 70 or below, so treating it as conclusive risks executing someone who is actually intellectually disabled.
Instead, when a defendant's IQ score falls within the test's acknowledged margin of error surrounding 70, the Constitution requires that the defendant be allowed to present additional evidence of intellectual disability, including evidence about how well they function in daily life. The Court based this conclusion on both the near-uniform practice of other states and the near-unanimous views of medical professionals that a single IQ score is never conclusive on its own.
Curious how the Court got there? See the step-by-step legal reasoning →
Why it matters
Death-row prisoners in states with strict IQ cutoffs can now demand a fuller hearing on intellectual disability even if their test scores are a few points above 70, since scores are inherently imprecise. States must rewrite or reinterpret laws that treat a single IQ number as final, and future capital cases will require closer attention to adaptive-functioning evidence alongside test scores.
What changes now
The case returns to the Florida courts, where Hall must now be allowed to present additional evidence of intellectual disability — such as evidence of adaptive-functioning deficits — despite his IQ scores being above 70. Other states with similarly rigid IQ cutoffs may need to revise how they handle intellectual-disability claims in capital cases. Whether Hall himself is ultimately found intellectually disabled remains to be decided on remand.
What this does not decide
The Court did not decide whether Freddie Lee Hall is actually intellectually disabled — only that Florida must let him present additional evidence beyond his IQ score. It also did not adopt one single nationwide method for measuring intellectual disability, leaving room for states to design their own procedures consistent with recognizing the test's margin of error.
Concurrences and dissents
Dissent — Justice Alito
“Today, the Court overrules the latter holding based largely on the positions adopted by private professional associations.”Alito's central objection that the majority relies on shifting professional opinion rather than legislative consensus.
Justice Alito argued that Atkins deliberately left states discretion to design their own procedures for identifying intellectual disability, and that no national consensus against Florida's approach actually exists once non-death-penalty states are properly excluded from the count. He criticized the majority for basing constitutional law on shifting views of private professional associations rather than legislative enactments, for misapplying the statistical concept of measurement error, and for improperly allowing evidence of adaptive-behavior deficits to substitute for proof of subaverage intellectual functioning. He would have affirmed Florida's rule.
How the Court got there
The legal reasoning, step by step
- The Court explained that the Eighth Amendment bars executing intellectually disabled people because doing so serves no legitimate purpose of punishment and risks convicting or executing people who are more prone to false confessions and less able to assist their own defense.
- To decide how intellectual disability must be measured, the Court looked to medical and psychiatric expertise, reasoning that the legal definition, while distinct from a clinical diagnosis, should be informed by the diagnostic standards doctors actually use.
- The Court found that IQ tests carry an inherent 'standard error of measurement' (SEM) — a statistical margin of error meaning a single score should be read as a range, not an exact number — and that medical professionals never treat one IQ score alone as conclusive proof of a person's mental capacity.
- Surveying state laws, the Court found that the overwhelming majority of states either lack the death penalty or allow defendants to present additional evidence of intellectual disability even when an IQ score is above 70, showing a broad societal consensus against rigid cutoffs.
- Exercising its own independent judgment, informed by both the near-national consensus and the medical evidence, the Court concluded that treating a test score as final and conclusive — while ignoring its built-in imprecision — cannot be squared with the Eighth Amendment's protection of human dignity.
- Because Florida's rule barred any consideration of other proof of intellectual disability once a score exceeded 70, even when that score fell within the test's margin of error, the Court held the rule created too great a risk that an intellectually disabled person could be executed.
Doctrinal impact
Cases affected by this decision
Limits Atkins v. Virginia (536 U. S. 304)
Clarifies and narrows the discretion Atkins gave states to define intellectual disability for death-penalty purposes.