In Greek mythology, as part of his quest, Oedipus must answer a riddle posed by the Sphinx: What goes on four legs in the morning, two legs at noon, and three legs in the evening? The answer is humans – a baby, an adult, and then in old age supported by a cane. The chapters in this Part similarly show how protean many of the concepts and constructs used in arguments about genetic privacy and genetic testing are, and how challenging that makes it for one-size-fits-all regulatory structures.