People with a substance use disorder can come into conflict with the law in various legal areas, often in criminal law. Forensic psychiatry is not solely concerned with the assessment, treatment, or prognosis of these individuals; it also aims to explain scientific connections for various professional groups confronted with the issues of addiction and delinquency. The book provides fundamental information on the occurrence, causes, and course of substance use disorders in relation to delinquency, as well as intervention and prevention options, and the forensic psychiatric work in this field.