Significant differences were observed between DUI arrestees and non-DUI arrestees with respect to ethnicity, age, and employment. In particular, DUI arrestees were significantly more likely than non-DUI arrestees to be white, older, and employed. Marital status and education were not significantly related to either arrestee group. Urinalysis data showed only small and nonsignificant differences between DUI and non-DUI arrestees with respect to testing positive for drug use at the time of arrest. DUI arrestees were somewhat less likely than non-DUI arrestees to test positive for marijuana, less likely to test positive for cocaine, and less likely to test positive for drugs other than marijuana. While DUI arrestees were significantly more likely than non-DUI arrestees to report having tried cocaine, DUI arrestees were less likely to report having tried marijuana and crack. Outcomes for indicators of self-reported drug use within the last 72 hours were similar for both DUI and non-DUI arrestees. About 4 percent of both DUI and non-DUI arrestees reported intravenous drug use in the last 6 months. While DUI arrestees were significantly less likely to self-report a need for crack treatment, both DUI and non-DUI arrestees expressed similar needs for marijuana and cocaine treatment. DUI arrestees testing positive for marijuana at the time of arrest were significantly younger than arrestees who did not test positive for marijuana. In addition, CUI arrestees testing positive for cocaine were significantly more likely to be black than those who tested negative for cocaine. 19 references and 4 endnotes