The setting is a level 1 Trauma Department, which serves a large and diverse patient population. Injured patients are screened for eligibility in the project based on a positive toxicology screen or self reported drug use in the past 90 days. The primary outcome of interest will be patients' subsequent drug use. Other outcomes of interest include: HIV-related risk behaviors, improved health outcomes (including injury reduction), increased employment, decreased engagement in illegal behavior, increased substance abuse treatment utilization, and enhanced quality of life at three, six, and twelve month follow-ups.