{"id":661,"date":"2012-04-04T03:44:37","date_gmt":"2012-04-04T08:44:37","guid":{"rendered":"https:\/\/antipolygraph.org\/blog\/?p=661"},"modified":"2026-05-19T23:16:55","modified_gmt":"2026-05-20T04:16:55","slug":"sanford-police-department-relied-on-voice-stress-analysis-in-trayvon-martin-shooting-investigation","status":"publish","type":"post","link":"https:\/\/antipolygraph.org\/blog\/2012\/04\/04\/sanford-police-department-relied-on-voice-stress-analysis-in-trayvon-martin-shooting-investigation\/","title":{"rendered":"Sanford Police Department Relied on Voice Stress Analysis in Trayvon Martin Shooting Investigation"},"content":{"rendered":"
\n

A lawyer for George Zimmerman, who on 26 February 2012 shot and killed unarmed 17-year-old Trayvon Martin, has\u00a0told<\/a>\u00a0WOFL television news\u00a0that his client passed a voice stress test administered by the Sanford, Florida Police Department. Criminal defense attorney Hal Uhrig made the statement in explaining why he believed that Zimmerman, whom he had not yet met, had acted in self-defense.<\/p>\n

However, voice stress testing (of any kind) is without scientific basis and has never been proven to work at better than chance levels of accuracy. A job posting by the Sanford P.D. indicates that the specific variety of voice stress testing it uses is the Computer Voice Stress Analyzer (CVSA), which is marketed by the so-called National Institute for Truth Verification<\/a>\u00a0(NITV), a West Palm Beach, Florida limited liability corporation. NITV has acknowledged<\/a> in federal court that “the CVSA is not capable of lie detection” (though it claims the opposite in its marketing materials).<\/p>\n

For more on CVSA, see ABC News Expos\u00e9 of Charles Humble and CVSA on YouTube<\/a>.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

A lawyer for George Zimmerman, who on 26 February 2012 shot and killed unarmed 17-year-old Trayvon Martin, has\u00a0told\u00a0WOFL television news\u00a0that his client passed a voice stress test administered by the Sanford, Florida Police Department. Criminal defense attorney Hal Uhrig made the statement in explaining why he believed that Zimmerman, whom he had not yet met, …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[10,138,139,137],"class_list":["post-661","post","type-post","status-publish","format-standard","category-voice-stress","tag-cvsa","tag-george-zimmerman","tag-sanford-police-department","tag-trayvon-martin","anons"],"yoast_head":"\nSanford Police Department Relied on Voice Stress Analysis in Trayvon Martin Shooting Investigation - AntiPolygraph.org News<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/antipolygraph.org\/blog\/2012\/04\/04\/sanford-police-department-relied-on-voice-stress-analysis-in-trayvon-martin-shooting-investigation\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sanford Police Department Relied on Voice Stress Analysis in Trayvon Martin Shooting Investigation - AntiPolygraph.org News\" \/>\n<meta property=\"og:description\" content=\"A lawyer for George Zimmerman, who on 26 February 2012 shot and killed unarmed 17-year-old Trayvon Martin, has\u00a0told\u00a0WOFL television news\u00a0that his client passed a voice stress test administered by the Sanford, Florida Police Department. 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