Funded by the Law Enforcement Assistance Administration, TRAP involved a 12-18 month voluntary regime for drug abusing offenders: 6 to 9 months in a special unit within a correctional institution and 6 to 9 months on parole. This report is based on interviews with 170 TRAP inmates in Maryland, 82 Trap inmates in Connecticut, and comparison groups of 151 inmates in Maryland and 146 in Connecticut. TRAP participants were a somewhat older group than nonparticipants in both States, with the 24-27 years age group being most prevalent. Over one-half of all inmates were black, over one-half had never been married, and almost one-half had not graduated from high school. Each inmate group reported high rates of unemployment. The most commonly abused drugs were heroin, marijuana, cocaine, and alcohol. Tables.