OPEN MINDS, The Behavioral Health & Social Service Industry Analyst Industry Feature A January 2005 press release from the Substance Abuse and Mental Health Administration (SAMHSA) detailed the scope of “co-occurring disorders”: 50% to 75% of patients in substance abuse treatment programs have co-occurring mental illness 20% to 50% of those treated in mental health settings have co-occurring substance abuse 27.3% of persons 18 and older in the past year with serious mental illness used an illicit drug . . .