States violate the U.S. Constitution if they use only an IQ score as a bright-line test to determine who is ineligible for the death penalty on ground of intellectually disability, the U.S. Supreme Court ruled on Tuesday.

“An IQ score is an approximation, not a final and infallible assessment of intellectual functioning,” Justice Anthony Kennedy wrote in a majority opinion striking down Florida law. Joining him were justices Stephen Breyer, Ruth Bader Ginsburg, Elena Kagan and Sonia Sotomayor.

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