Abstract
The vulnerability of competency to stand trial instruments to malingering was previously unexamined. In this study, the Georgia Court Competency Test (GCCT) was administered to offenders asked to feign incompetency; their results were compared to controls and pretrial defendants (both competent and incompetent). Offenders appeared to be able to simulate incompetency and tended to score lower on the GCCT than their truly incompetent counterparts. For the detection of simulators, a newly developed Atypical Presentation scale for the GCCT showed promise. In addition, several strategies were explored that included simulators' failure of very simple items (i.e., floor effect) and variable success on items of increasing difficulty (i.e., performance curve). Optimal cutting scores are presented for forensic clinicians to screen defendants for feigned incompetency.
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