The NOHSAP-TC program served adults experiencing homelessness and substance use disorders in the greater New Orleans area. Only people who completed a seven-day detoxification program in the NOHSAP facility could enroll in TC. The detoxification program involved daily group meetings, limited assessment and case management, and an introduction to principles from Alcoholics Anonymous, Narcotics Anonymous, and Cocaine Anonymous. During the TC program, participants were housed in the NOHSAP residential facility.