“…In the context of organ donation, the crucial distinction between brain death, which involves the irreversible 5 A number of additional studies focus on a single state before and after a helmet law change. For examples, see Auman et al (2002), Bledsoe et al (2002), Bledsoe and Li (2005), Eberhardt et al (2008), Hotz et al (2002), Kraus et al (1994), Mayrose (2008), Mertz and Weiss (2008), Muller (2004), andMuller (2007).…”