Substance Checking Outreach and Pre-Exposure Prophylaxis (PrEP) Engagement Study

"Participants will not be assigned to the intervention as it will be available to everyone.~Check it will be a van-based HIV- and overdose-prevention program offered in the four areas of Baltimore city from which study participants are recruited. Intervention services will include point-of-care drug checking and PrEP assessment, prescription, and management, and they will be available to everyone, regardless of whether they are part of the SCOPE study cohort or not.~Individual-level service usage data collected by intervention staff will not be considered in analysis of outcomes. However, study participants will self-report Check it utilization on the internally-developed surveys at 6, 12, and 18 months."