Contrasts between admitters and deniers of drug use.

This study evaluated the agreement between self-reported drug use and urinalysis results in 232 men and 27 women opiate-dependent patients at 2, 7, and 24 months following admission to methadone maintenance treatment. Differences between deniers, those who stated that they had not used drugs, but whose urinalysis results were positive, and admitters of drug use on several psychosocial variables, Axis I and II pathology and degree of psychopathy were examined. Generally, more drug use was acknowledged by self-report than found in urinalyses. Evidence was limited that deniers were consistently different than admitters. Deniers had a significantly greater increase from initial psychopathy ratings made using interview only information to final psychopathy ratings made utilizing interview and collateral information.