David A. Peters offers an original probability theory that contains the social and legal treatment of drug addicts, the value of current drug treatment programs, and clear implications for legalization of currently controlled substances. The appendices cover probability , chemistry, genetics, and psychology. These appendices contain much technical information and are written in an approachable style. Numerous law enforcement officials have found The Probability of Addiction an interesting and useful tool. This study contributes to the elements of a coherent theory of drug addiction. No one before has attempted a predictive, mathematical model of drug addiction. The Probabilityof Addiction will appeal to anyone with interest n Criminal Justice, Law or Public Administration.