Are validation scales useful for Detecting Deliberately Faked Personality Tests? A study in incarcerated populations

Abstract

Personality self-report questionnaires are frequently used in forensic settings to detect psychopathology, to predict recidivism, and to assess adaptability to life in prison. Although most personality questionnaires include validity or control scales, even with the scales most outcomes can be easily manipulated. The aim of this study is to analyze the utility of the control scales of the Situational Personality Questionnaire. A sample of 200 male prisoners was randomized into two groups. Both groups completed the SPQ as a part of the mandatory psychological assessment when they entered prison, and then again 8 months later. In time 2, one group received instructions to falsify the results of the questionnaire. Results indicated that the feigned induction was effective. The control scales were not able to detect feigners. Results are discussed with regard to their implications for further research into assessing fake responses in forensic settings.