 In a Rawlsian vein, one might try to establish an obligation to participate in clinical research based on the choices individuals would make regarding the structure of society from a position of ignorance regarding their own place within that society, from behind a veil of ignorance (Rawls 1999). To make this argument, one would have to modify the Rawlsian argument in several respects. The knowledge that one is currently living could well bias one’s decision against the conduct of clinical research. Those who know they are alive at the time the decision is being made have already reaped many of the benefits they will receive from the conduct of clinical research.