Hamm v. Smith · ¶130

In the years since Atkins, IQ has remained a central component of intellectual-disability diagnoses and Atkins claims. On the diagnostic end, “[i]dentifying defcits in intellectual functioning via IQs” continues to be “the standard of practice, as it has been for approximately a century.” R. Floyd, R. Farmer, W. Schneider, & K. McGrew, Theories and Measurement of Intelligence, in 1 APA Handbook of Intellectual and Developmental Disabilities 392 (L. Glidden ed. 2021) (APA Handbook). Likewise, governments continue to incorporate IQ thresholds into intellectual-disability definitions that determine a defendant's eligibility for the death penalty. See, e. g., Ex parte Perkins, 851 So. 2d 453, 456 (Ala. 2002); Ky. Rev. Stat. Ann. § 532.130(2) (West Cum. Supp. 2025).

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