Study aims are: Aim 1 (R61): Develop the intervention protocol for delivery of LAI PrEP + XR-B. We will conduct interviews with stakeholders (staff at partner and other carceral and community sites, n=18:) and currently or recently incarcerated individuals (n=18). Interviews will focus on how to optimize intervention components for the R33 phase. Aim 2 (R33): Evaluate implementation facilitation as a strategy to support co-located LAI PrEP + XR-B in carceral and re-entry settings. Guided by the Consolidated Framework for Implementation Research (CFIR), implementation outcomes from Proctor et al.,including acceptability, appropriateness, adoption, feasibility, and sustainability will be assessed using surveys, interviews, and administrative records. Aim 3 (R33): Compare the effectiveness of co-located LAI PrEP + XR-B to oral PrEP + SL-B. Patient preference trial for 450 adults who are clinically indicated for both PrEP and MOUD and soon-to-be-released from a carceral setting to either LAI Prep + X-RB (n=150) or oral PrEP + SL-B (n=150) treatment initiated in jail or prison. A baseline assessment will be conducted prior to release followed by monthly follow-up for 7 months and a final long-term follow-up visit at 12-months.