This article discusses a study which examined the impact of the Edinburgh Prison (Scotland) Drug Reduction Programme (DRP) on the drug-using behavior of clients during their prison sentences. The study covered 30 drug users who participated in the DRP. It interviewed the participants a month after completing the programme. The participants used cannabis, dihydrocodeine, buprenorphine, temazepam, diazepam and lysergic acid diethylamide (LSD.) The study recommended the adoption of the programme by other prisons.