Trust is crucial in areas of medicine and health. But what sort of explicit consent should doctors obtain before medical treatment? Onora O'Neill discusses the place of trust in areas of bioethics with Nigel Warburton in this episode of the Philosophy Bites podcast (originally on Bioethics Bites, a series made in association with the  Oxford Uehiro Centre for Practical Ethics and made possible by a grant from the Wellcome Trust).