RecruitingBehavioural interventionReducing Opioid Mortality in IllinoisReducing Opioid Mortality in Illinois (ROMI) is 5-year research study led by the University of Chicago in partnership with the University of Illinois at Chicago's (UIC) Community Outreach Intervention Projects (COIP), the Illinois Criminal Justice Information Authority (ICJIA) and the American Institutes for Research (AIR). ROMI aims to understand and test strategies for linking individuals with a history of opioid use disorder who are released from Illinois jails and prisons to substance use treatment. ROMI is one of twelve grants awarded by the National Institutes of Health (NIH) as part of the Justice Community Opioid Innovation Network (JCOIN) to support research on quality addiction treatment for opioid use disorder in criminal justice settings nationwide.