Treatment at NorthStar Detox & Rehab Center begins with participation in an initial complete psychiatric evaluation. Mental illness and SUD often go hand in hand. Approximately 50% of clients with SUD have some form of accompanying mental illness. The initial psychiatric evaluation will allow the NorthStar staff to advise the clients of any mental illness co-occurring with the SUD, and will evaluate the need for both psychiatric and pharmacologic medical treatment for such mental illness. Treatment of underlying medical illness is key to successful SUD treatment.