David Nutt, Professor of Neuropsychopharmacology at Imperial College London and former Chairman of the Advisory Council on the Misuse of Drugs, drops by to discuss the the role of Cocaine in the recent Banking Crisis, his current struggle to conduct a clinical trial on the effects of the psychedelic psilocybin on depression, how Amy Winehouse's death could have been used as a public example of the dangers of alcohol, and his frustration with current laws regarding cannabis.