- Be a current, recreational, nondependent, polydrug user defined as nonmedical use with at least 2 types of perception-altering drugs of abuse (example, lysergic acid diethylamide, cannabinoids, ketamine, ecstasy/3,4-methylenedioxy-methamphetamine, phencyclidine, psilocybin, and ring-substituted amphetamines with perception altering effects) and at least 10 total lifetime occasions of use with perception-altering drugs of abuse and who like their effects