Utility of the Inventory of Legal Knowledge in detecting feigning

Kevin D. Wahl, Michael J. Vitacco, Nancy Ryba Panza, Trevor F. Hyde

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


The Inventory of Legal Knowledge (ILK) is an instrument designed to detect feigning of competency-specific knowledge deficits. Available studies have suggested the ILK may require modification of its cut score to more accurately classify those who are feigning. In this study, the ILK’s concurrent validity and cut scores were tested using 100 college students in a simulation design. Students were randomly assigned to fake (n = 50) or honest (n = 50) groups. Those assigned to the faking group had significantly lower ILK scores than individuals responding honestly with a large effect size between the groups. Despite some promising results, utility estimates indicated an unacceptable level of false positives using the recommended cut score. Tentative recommendations are made in order to improve the efficacy of the ILK in detecting feigning legal knowledge.

Original languageEnglish (US)
Pages (from-to)483-497
Number of pages15
JournalJournal of Forensic Psychiatry and Psychology
Issue number3
StatePublished - May 4 2018


  • Inventory of Legal Knowledge
  • competency to proceed to trial
  • feigning

ASJC Scopus subject areas

  • Clinical Psychology
  • Psychiatry and Mental health


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