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This study examined the validity of the Assessment of Depression Inventory (ADI), a 39-item measure of depression with three embedded validity scales, using inpatient participants. The ADI Depression (Dep) and Feigning (Fg) scales were compared to the corresponding scales of a widely used multiscale instrument, the Personality Assessment Inventory (PAI). The correlations between this test and the ADI appear to indicate that the ADI is effective in measuring the constructs of both depression and purposeful distortion. The efficacy of various ADI Fg scale cut scores was addressed using the PAI validity scales as a criterion. A receiver operator curve based on this data produced an area under the curve of 85.3% for 14, the most optimal cut score. Depression and Anxiety 23:434-436, 2006. © 2006 Wiley-Liss, Inc.