Various investigative techniques for detecting deception have appeared in the past 80 years. Some were developed by scientists and researchers, like reaction time tests, the polygraph and the brain wave methods. Others were proffered by manufactures without the help of researchers, such as the B&W lie detector and the various voice stress devices. The most recent method being heralded as the new lie detector is the Computer Voice Stress Analyzer (CVSA).
There are no validated algorithms or scoring systems, or sophisticated analytical methods. These shortcomings have not prevented the manufacturer from making remarkable claims regarding the efficacy of its product.
But, are they true? Those of us in the detection of deception profession would like too believe it, because switching to this new device would allow us to better serve our clients and agencies in a shorter time. Before we accept the self-endorsements of the manufacturer, it is best that we first look at what scientists have to say.
Below is the list of university-grade research studies that have investigated voice stress as a deception detection approach. Some studies looked at the CVSA device particular, while other investigated whether voice stress analysis in general could be used to detect stress or deception. Copies of these studies can be obtained at many university libraries.