Why did the U.S. Supreme Court find that the IQ cutoff score used in Florida was unconstitutional for deciding whether a person was intellectually disabled and therefore ineligible for the death penalty?

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The U.S. Supreme Court found that the IQ cutoff score used in Florida was unconstitutional because Florida did not consider the standard error of measurement of the test score. The standard error of measurement would account for a range of scores that would be considered acceptable, rather than simply using a strict cutoff score. Therefore, the strict IQ cutoff score used in Florida could lead to the misclassification of individuals as intellectually disabled and therefore ineligible for the death penalty.

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