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October 16, 2005
Arguments rage over voice-stress lie detector
The Arizona Republic Oct. 10, 2005
At least 20 Arizona law enforcement agencies are relying on a voice-measuring lie detector for criminal investigations even though experts say the device does not stand up to scientific scrutiny and may prompt innocent suspects to make false confessions. The Computer Voice Stress Analyzer, or CVSA, purportedly measures FM radio waves produced by muscles around the larynx. Deceptive answers cause stressful "micro-tremors" in the voice that are charted by the device's software program, the manufacturer says. Yet, independent experts have consistently found the instrument to be dubious, at best, when it comes to separating truth from lies.
Posted by Emma at October 16, 2005 10:28 AM
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