Little research has focused on systematically integrating clinical treatment within existing drug court procedures. This could be particularly useful for clients with substance use disorders, who comprise those on court dockets and often have co-existing mental health issues. This article reports on the preliminary outcomes of integrating MISSION-Criminal Justice (MISSION-CJ), a co-occurring mental health and substance use wraparound intervention, within two Massachusetts drug courts. In this open pilot, clients completed intake and 6-month follow-up assessments. The participants were primarily Caucasian (86%), male (82%), had at least 2 prior arrests, and received outpatient treatment for mental health (54%), alcohol use (51%), or drug use (88%) prior to enrolling in MISSION-CJ. Six-month follow-up data suggested that participants showed statistically significant reductions in average number of nights spent in jail, alcohol use, and drug use, as well as an increase in full time employment.