Quantitative Interview
BehavioralIndex participants will be interviewed every six months (with phone interviews focused on service utilization at each six month interval midpoint) for 18 months while network members will be interviewed at baseline and one year. Interviews will consist of in-depth face-to-face and audio computer-assisted interviews (ACASIs) and a structured diagnostic interview to assess engagement in care (number of clinical visits attended), substance use, attitudes about substance use, friend's substance use, sexual risk behaviors, PTSD (for index participants only), support of index participants care use (network participants only), attitudes about healthcare (network participants only), index participant's adherence (network participants only), own functioning (network participants only), and family functioning (network participants only). At Baseline only, a urine sample will be collected from index participants for drug testing to assess the agreement between urine and ACASI.