These studies led the experimenter to investigate the use of chemical aversion therapy using anectine as the aversive stimulus with a morphine addict. The success of Thomason and Rathod with heroin addicts suggested that their experimental method would be useful as a reference while designing this study. The treatment hypothesis was that the patient's use of intravenous narcotic drugs would be eliminated through the application of chemical aversion therapy. Chemical aversion therapy was operantly defined as the injection intravenously of anectine into the patient concurrent with his self-injection of his narcotic of choice.