 In the United States, the states have adopted criteria for the death of a person modeled on the Uniform Determination of Death Act (developed by the President’s Commission, 1981), which says that “an individual who has sustained either (1) irreversible cessation of circulatory and respiratory functions, or (2) irreversible cessation of all functions of the entire brain, including the brain stem, is dead. A determination of death must be made in accordance with accepted medical standards.” In the United Kingdom, the accepted criterion is brain stem death, or the “permanent functional death of the brain stem” (Pallis 1982).