This data collection documents an evaluation of the Los Angeles County Sheriff's Regimented Inmate Diversion (RID) program conducted with male inmates who were participants in the program during September 1990-August 1991. The evaluation was designed to determine whether county-operated boot camp programs for male inmates were feasible and cost-effective. An evaluation design entailing both process and impact components was undertaken to fully assess the overall effects of the RID program on offenders and on the county jail system. The process component documented how the RID program actually operated in terms of its selection criteria, delivery of programs, length of participation, and program completion rates. Variables include demographic/criminal data (e.g., race, date of birth, arrest charge, bail and amount, sentence days, certificates acquired, marital status, employment status, income), historical state and county arrest data (e.g., date of crime, charge, disposition, probation time, jail time, type of crime), boot camp data (e.g., entry into and exit from boot camp, reason for exit, probation dates, living conditions, restitution order), drug history data (e.g., drug used, frequency, method), data on drug tests, and serious incidence data. The impact data were collected on measures of recidivism, program costs, institutional behavior, and RID's effect on jail crowding.