The typical respondent was nonwhite, poor, a high school dropout, a mother, and previously involved with the law. The vast majority (85 percent) of respondents used heroin or cocaine, and a majority of these subjects used drugs daily. Educational level, ethnicity, presenting charge, and age were not significantly related to crime rates. Crime rates were significantly higher among drug users than among nonusers and were higher among heroin and/or cocaine users than among those who used other illegal substances. Mean rates of violent crime were low among all subjects. Finally, cocaine and cocaine/heroin users comprised the largest subgroup of subjects in the sample, and once-daily cocaine/heroin users showed higher offense rates than did multiple-daily users, irregular users, or nonusers. 9 tables and 36 references.