On strong readings, the precautionary principle aims to convert epistemic uncertainty into a guardianship of the status quo, gently turning away those who would seek to build a better future with the imperative to ‘do more research’. We might also consider here that the precautionary principle contains an almost inherent lacuna: it ignores the risks of its own application. In seeking to err always on the side of caution, and hence of eliminating risk, it contains a blindness to the dangers of inaction and omission.