Mental deficiencies and the death penalty

With a hat tip to How Appealing, I see Elaine Cassel has this commentary at FindLaw entitled "Executing the Mentally Ill and the Mentally Retarded: Three Key Recent Cases from Texas and Virginia Show How States Can Evade the Supreme Court's Death Penalty Rulings."  Here is a taste:

In this article, I will explain the current status of the law on executing mentally ill and retarded persons, and argue that in states like Texas and Virginia, the Supreme Court's mandate that these classes of persons be spared the ultimate penalty has been reduced to mere wishful thinking.