High Quality Content by WIKIPEDIA articles! Voice Stress Analysis (VSA) is a controversial lie detection technology. It has been described as pseudoscientifi, and there is no known scientific basis for the underlying theory of "microtremors". Federally funded research showed "little validity" in the technique. A study by Virginia State in 2003, at which time the technique was in widespread use, concluded that "Because there have been no independent scientific studies conducted on the reliability of the computer voice analyzer to detect deception, the Board recommends to the Director of the Department of Professional and Occupational Regulation that computer voice analyzer equipment should not be approved in Virginia at this time.", though a number of academic studies are available which call into question the validity of the technique

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