Messages in the mass media shed light on how people are thinking about drugs, and they also both reflect and influence policies on drugs. However, that is by no means saying that media messages are a true representation of drug users' and suppliers' own experiences and perceptions. Here lies one of the critical problems of drug policy: the issue of which methods and messages will be most effective in managing the drug market. Markets, methods and messages are the three central themes of this book, with a focus on Europe. Authors include social scientists from a range of disciplines, including psychology, sociology, anthropology and criminology. In reporting on their systematic research on drug use, drug users and drug suppliers, some authors address one of the themes, others a combination. Together, their contributions illustrate the dynamic nature of drug markets, messages about drugs, and methods of investigating the world of drug users and suppliers.