The Sangamon County Illinois Assisted Outpatient Treatment Program (SCI-AOT) is a comprehensive collaboration of Southern Illinois University School of Medicine (SIU SOM), Memorial Behavioral Health, Sangamon County Circuit Court and State's Attorney, Springfield Police Department, behavioral health care, and community providers. The overall program goal is to deliver evidence-based practices to reduce the incidence and duration of psychiatric hospitalization, homelessness, incarcerations, and interaction with the criminal justice system, while improving the health and social outcomes of individuals with serious mental illness (SMI) and/or substance use disorder (SUD). Families will be included in care, though not counted in the service estimate. Ongoing community partnership is ready to begin robust implementation, continuation, and evaluation of the SCI-AOT program. A peer support specialist, care coordinator, and other navigation assistant personnel will engage and link participants with appropriate needed healthcare services, including SIU SOM Center for Family Medicine, Department of Psychiatry clinic, and Office of Community Initiatives and Complex Care.