About Voice Stress and the Law
Polygraph is the only approved detection of deception method (lie detection method) approved for use within the United States Federal Government and numerous States. No federal government agency that has an established and accredited detection of deception program uses any form of voice stress analysis.
A review of 24 empirical studied that were conducted over a period of more than 30 years failed to provide evidence of the validity or reliability of Voice-Stress analysis based technologies for the detection of deception in individuals.
The Virginia Department of Occupational Professionalism and Regulation recently prepared a report on voice stress. This document was pivotal in the decision by the Virginia State Legislature to disallow the use of Voice-Stress analyzers in criminal investigations.
In addition, individuals are cautioned that using a service that utilizes voice-stress analysis over the telephone to surreptitiously record another individual are in violation of State of Illinois and or Federal Communication Commission laws (for interstate recordings).
Below is a list of the university-grade research studies that have investigated voice stress as a deception detection approach:
University of Oklahoma – Voice Stress Analysis (Excerpt):
University of Florida – Voice Stress Analysis (Excerpt):
Cestaro, V.L. (1995). A Comparison Between Decision Accuracy Rates Obtained Using the Polygraph Instrument and the Computer Voice Stress Analyzer (CVSA) in the Absence of Jeopardy. (DoDPI95-R-0002). Fort McClellan, AL: Department of Defense Polygraph Institute.
Fuller, B.F. (1984). Reliability and validity of an interval measure of vocal stress. Psychological Medicine, 14(1), 159-166
Horvath, F. S. (1979). Effect of different motivational instructions on detection of deception with the psychological stress evaluator and the galvanic skin response. Journal of Applied Psychology, 64(3, June), 323-330.
Suzuki, A., Watanabe, S., Takeno, Y., Kosugi, T., & Kasuya, T. (1973). Possibility of detecting deception by voice analysis. Reports of the National Research Institute of Police Science, 26(1, February), 62-66.
Waln, R. F., & Downey, R. G. (1987). Voice stress analysis: Use of telephone recordings. Journal of Business and Psychology , 1(4), 379-389.