Florida’s statute, as interpreted by the state supreme court, sets the definition of developmental disability at an IQ score of 70 or below. With anything higher, the defendant cannot put on other evidence to show he is intellectually disabled. Moreover, the state does not allow use of the standard error of measurement that is deemed inherent in IQ tests.

Hall’s various test scores added up to an average of more than 70, but no more than 75, meaning that he would qualify as having a disability if the state had used the standard five-point error of measurement. Without that statistical norm, however, Hall’s lawyers were barred from putting on any other evidence of disability — for example, school records that consistently identified Hall as being mentally retarded.

“Florida’s position is inconsistent with the views of all the mental disability organizations and professional organizations that are involved in the definition of mental retardation,” says Jim Ellis, a longtime advocate for people with mental disabilities. He has also filed a brief in the case.

Allowing states to redefine “mental retardation” in defiance of professional standards, he argues, is nothing more than a way to undo the Supreme Court’s 2002 ruling.