 This new development also raises substantive normative questions. For example, imagine that the same basic principle underlies legitimate political regimes and legitimate medical experimentation. It may follow that either tacit consent to a political regime, which  Lockean contract theorists  often cite, cannot successfully legitimize political regimes; or that tacit consent successfully legitimizes medical experimentation, rendering long consent forms unnecessary. Likewise, imagine that the same basic principle underlies the legitimate procurement of income and that of organs for transplantation. Then perhaps either income tax—without tax-payers’ consent—is illegitimate (Nozick 1986), or a “kidney tax” could be perfectly legitimate (Fabre 2008, chs. 4–5). Either way, existing practice in one of these domains would be misguided.