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The effect of defensive responding by substance-abusing patients on the Million Clinical Multiaxial Inventory.

This study explored the effect of defensive (i. e., fake-good) responding by substance-abusing patients on the scale scores of the Millon Clinical Multiaxial Inventory (MCMI-II; Millon, 1987). Patients asked to respond honestly (N = 62) had significantly higher scores on most of the scales than patients who were instructed to respond defensively (N = 62) and forensic subjects suspected of abusing psychoactive substances (N = 54). Significantly fewer subjects in the defensive responding simulation and the forensic group had elevated the Drug Dependence and Alcohol Dependence scales compared to the honestly responding patients. These results indicate that most drug-abusing individuals can conceal the presence of a substance-related disorder, as reflected by scale scores on the MCMI-II, if motivated to do so.