Yes, CVSA uses something like the "control" questions used in polygraphy. But it's pointless to attempt to alter one's voice. While CVSA, like polygraphy, is completely without scientific basis, its methodology does not lend itself to the same kinds of countermeasures that polygraphy does.

Your best bet going into a CVSA "test" is to arm yourself with knowledge about this fraudulent procedure. The "test" is a sham. It's all about interrogation If you'd like to receive the chapter from the CVSA examiner handbook regarding pre-employment screening, contact me by e-mail and I'll be happy to send it to you.

Also, while it's pointless to attempt to control one's CVSA charts, the "behavioral countermeasures" presented in The Lie Behind the Lie Detector may be helpful with regard to CVSA.