Clinical Research Directory

Inclusion Criteria: 1. housed in K6G unit or within 12 months post-release from incarceration 2. ages 18-49 years 3. screens positive for Substance Use Disorder (SUD), or has sought or received SUD treatment at any time starting 12 months before the most recent incarceration until the present day. 4. reports sexual intercourse with a male or a male-to-female transgender woman in the six months prior to jail entry 5. if recruited in jail, is likely to be remain either in custody for at least four more days, but less than three more months based on scheduled court dates, current sentence, treatment plan, etc. 6. has not received an HIV diagnosis (based on self-report) 7. plans to reside in Los Angeles County for the 12 months following enrollment Exclusion Criteria: 1. does not have a smartphone and is not willing to obtain one post-release, 2. is not able to speak and understand English, and 3. does not have sufficient reading skills to operate a mobile app