 It is interesting that for public health interventions, whose impact on human health can exceed that of clinical interventions, usually little, if any, informed consent is mandated. Exposure to ads and “nudges” that promote populations’ health seems legitimate to most of us even when the authority executing the interventions discloses very little about these interventions, their risks, their alternatives, and any real opportunities to avert them. Changes to traffic regulations that affect accident rates on a grand scale are not thought to demand the consent of each individual citizen. Nor are such changes considered necessary when they are experimental (despite Richter et al. 2001)--health policy trials may require a very different approach to consent than clinical trials. 