Comorbid substance use disorder (SUD) and depression is highly prevalent and associated with elevated rates of post treatment relapse to substance use, HIV risk behavior, and associated poor mental and physical health outcomes. Further, rates of substance use and depression disproportionately affect minority groups and those living in poverty. Although efficacious, the often complex, specialized nature of CBT poses problems in its integration into substance use treatment programs. Budget cuts for mental health and substance use treatment both nationally and in the state of North Carolina, reduce availability of publically funded treatment programs and staff to patient ratios. To address this limitation, a behavioral activation (BA) treatment, the Life Enhancement Treatment for Substance Use (LETS ACT), was developed to treat depressive symptoms among a predominantly African American sample of low income illicit drug users currently receiving residential substance use treatment. Collectively, two Stage I studies and 1 year follow-up data from the investigators Stage II R01DA026424 indicate that compared to a control condition, LETS ACT is associated with significantly better outcomes for treatment retention, post treatment abstinence, HIV sexual risk behavior, depressive symptoms, and environmental reward.