Computer voice stress analyzer tests debated

Another TV expose of the use of Computer Voice Stress Analyzers in the USA, this time from Colorado’s 9 News (1 November):

A device used by Colorado law enforcement agencies to identify when someone is lying, may not work and may be costing taxpayers money. Computer Voice Stress Analyzers (CVSAs) claim to measure changes in a person’s voice that indicate a lie. However, three recent studies say the device does not accurately tell the difference between a person lying and a person telling the truth. CVSAs have been used by 21 law enforcement agencies in Colorado.

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