Read the list of Supreme Court cases from the section “What are some major death penalty decisions?"
Gregg v. Georgia (1976)
McCleskey v. Kemp (1987)
Atkins v. Virginia (2002)
Roper v. Simmons (2005)
Which two cases taken together provide the BEST evidence to support the idea that specific groups of people have mitigating factors that prevent them from being subject to the death penalty?