 Different kinds of interventions raise different issues for assessing questions of legitimacy. The Nuffield Council on Bioethics has provided an influential “intervention ladder” (Nuffield Council on Bioethics 2007), which effectively rank orders various types of interventions on a continuum that is meant to function as a guide to the acceptability and justification of public health policies. The ladder is anchored at one end by what is presented as the least intrusive option, doing nothing, and at the other end by what is presented as the most intrusive option, eliminating choice altogether (as in compulsory isolation). The Council makes plain that all rungs on the ladder, including doing nothing, require justification and that the ladder is to be taken only as a tool in the moral analysis of public health policies.