Toby Seddon is a Professor in the School of Law at the University of Manchester and a co-founder of the research group ManReg (The Manchester Centre for Regulation, Governance & Security). He has been involved in drugs research for nearly 20 years and has a particular interest in developing new regulatory perspectives on drug policy. Lisa Williams is a Lecturer in Criminology in the School of Law at the University of Manchester. Her principal interests are in the area of recreational drug use and she is co-author of the revised edition of the landmark text Illegal Leisure Revisited (Routledge, 2011). Her monograph Changing Lives, Changing Drug Journeys (Routledge, 2012) examines drug-taking in the context of the life-course. Robert Ralphs is a Senior Lecturer in Criminology in the Department of Sociology at Manchester Metropolitan University. He has diverse research interests, including drug use, youth gangs and youth crime. He is co-author of a forthcoming book based on a major ethnographic study of youth gangs (Youth Gangs in an English City, Routledge).