In a 5-4 ruling today, the SC ruled that death penalty eligibility can't solely be judged on the results of an IQ test:

http://www.scotusblog.com/2014/05/opinio…

Justice Alito wrote the dissent (covered in the last paragraph of the linked story), in which he whines about eligibility being handed to mental health pros instead of being left to the will of the voters. Yeah...fuck you, Sam.