I am the founder of a small, vocal, Freethinker/skeptical group here in the South and our local police station (city population 55,000), have purchased one or more of these CVSA programs. From what I have seen so far it appears to be  nonsense. I am researching an article for our local paper and for a lecture I am giving this weekend. I hope to interview the police about the device, perhaps tomorrow. I need some really good, the best, info roasting this stuff so I can do a good job of drawing attention to this waste of money.
   I emailed the "National Center for Truth Verification" who I think they bought them from ($10,000 a pop plus $1,600 per person per week for training). I asked them for any scientific, peer-reviewed evidence that their devices work, and asked them what they claim for accuracy. They have not responded. Our city is having a bit of a budget crisis and I am a little pissed that all this money has been spent on this nonsense.
   Any help is appreciated. Thanks, Darrel

ph. 479-442-6738

The CVSA is an overpriced prop for interrogations. To my knowledge, there is no peer-reviewed research available regarding CVSA, and the only studies purporting to support its validity as a lie detector come from the manufacturer.

The best source I could refer you to is David T. Lykken's book, A Tremor in the Blood: Uses and Abuses of the Lie Detector (2nd ed., 1998). Chapter 11 deals with voice stress analysis.

On the Internet, you'll find details of some studies conducted by the Department of Defense Polygraph Institute on the following website:

http://www.voicestress.com 

It's amusing that the operator of the above site promotes the competing pseudoscience of polygraphy.

I'd be interested to hear how your presentation goes!

yep pay $ 40.00 bucks just for the fun of it....and would hope it works...lol