Actually, all death penalty inmates ought to be tissue typed for organ harvesting. If a New Mexico inmate is a match for a woman in Florida who needs a new heart, he oughta be flown to Florida yesterday, anesthetized, his heart transplanted into the recipient, and the inmate's body released to his relatives.
Now that would be paying for his crime and giving back what he took: LIFE!
Create a motive for finding folks with the right blood type guilty of a capital offense. Can't see how that could ever lead to any unforeseen consequences.
