The proportion of people admitted for drug abuse treatment over 50 nearly doubled between 1992 and 2008.  While alcohol still is the leading cause of admissions in this age group, sharp increases were noted in those needing treatment for heroin, cocaine and marijuana, according to the study published by the Substance Abuse and Mental Health Services Administration (SAMHSA). You can read more in the The DASIS Report: Older Adults in Substance Abuse TreatmentYou can read more Arizona specific stuff in our Annual Report on Substance Abuse Treatment Programs which is posted along with all of our other Reports Required by State Statute.