These data were collected to measure the degree to which subjective deterrence and rational choice are effective in reducing drug-use recidivism rates. Baseline interviews were conducted with participants upon entering a drug rehabilitation program in New Jersey. Under the terms of this program, which was an alternative to prison, any incident of drug use occurring during the rehabilitation period would result in the participant's returning to prison. Follow-up interviews were conducted when the participant either had a drug/alcohol use relapse or successfully completed a year in the program without a drug-use incident. Baseline interviews included questions about criminal and drug-use history, as well as initial reactions to the drug rehabilitation program. Follow-up interviews probed for participants' feelings about the drug rehabilitation program experience. Further questions concerned participants' failure or success at staying away from drugs or alcohol.