Patients with addictions and concurrent disorders constitute the most underserved population in the system of care. There are numerous reasons why this population has so much difficulty accessing services, including behavioural issues, criminal engagement, and non-compliance with outpatient services. To improve services to this population which is marked by multiple morbidities, high mortality and insufficient access to health care, the government of British Columbia, Canada developed a program for people with both substance use disorder and one or more mental disorders who have not benefited from previous therapies.