This key work exposes international studies from leading social sciences researchers who use various theoretical perspectives and methodological orientations to depict deviant drug and crime-related pathways. The chapters have been grouped into four sections. The first section, Deviance, Set and Setting, discusses a new basis for the understanding of deviant pathways. The second section, Youth, Drug and Delinquency Pathways, presents empirical studies which help to understand the drug-crime relationship. The third section discusses Adult, Drug and Crime Pathways adopted by drug users, flexers , traders or dealers, and traffickers. Finally, the fourth section, Ways Out of deviant pathways, explores approaches for controlling drug use and criminality socially or individually, with or without legal intervention or formal help. In short, this book presents an invaluable overview of the most advanced research in the field of deviant drug-and crime-related pathways.