Prevalence and trends of non-medical opioid and other drug use histories among federal correctional inmates in methadone maintenance treatment in Canada

Pre-MMT opioid and other problematic non-opioid drug use in the sample was high. Temporal and regional patterns of drug use observed may reflect developments in the general population, e.g. increasing PO misuse. The observed drug use patterns underscore the need for targeted drug specific prevention/treatment measures in correctional environments beyond existing interventions.