{"id":157,"date":"2007-07-30T07:26:16","date_gmt":"2007-07-30T11:26:16","guid":{"rendered":"https:\/\/antipolygraph.org\/blog\/?p=157"},"modified":"2026-05-31T02:50:06","modified_gmt":"2026-05-31T07:50:06","slug":"oklahoma-study-finds-voice-stress-analysis-testing-no-better-than-random-chance","status":"publish","type":"post","link":"https:\/\/antipolygraph.org\/blog\/2007\/07\/30\/oklahoma-study-finds-voice-stress-analysis-testing-no-better-than-random-chance\/","title":{"rendered":"Oklahoma Study Finds Voice Stress Analysis “Testing” No Better Than Random Chance"},"content":{"rendered":"
\n

The National Institute of Corrections has published a research study<\/a> on voice stress analysis (VSA) conducted by the Oklahoma Department of Mental Health and Substance Abuse Services with support from the National Institute of Justice. From the abstract (emphasis added):<\/p>\n

…The goal of this study was to test the validity and reliability of two popular VSA programs (LVA [Layered Voice Analysis] and CVSA [Computer Voice Stress Analyzer]) in a “real world” setting. Questions about recent drug use were asked of a random sample of arrestees in a county jail. Their responses and the VSA output were compared to a subsequent urinalysis to determine if the VSA programs could detect deception. Both VSA programs show poor validity<\/em> – neither program efficiently determined who was being deceptive about recent drug use. The programs were not able to detect deception at a rate any better than chance….<\/strong><\/p><\/blockquote>\n

The 128-page report, “Assessing the Validity of Voice Stress Analysis Tools in a Jail Setting” by Kelly R. Damphousse, Laura Pointon, Deidre Upchurch, and Rebecca K. Moore, dated 31 March 2007, may be downloaded from AntiPolygraph.org here<\/a> (2.1 mb PDF).<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

The National Institute of Corrections has published a research study on voice stress analysis (VSA) conducted by the Oklahoma Department of Mental Health and Substance Abuse Services with support from the National Institute of Justice. 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