![]() When a test subject is lying, the automatic, or involuntary nervous system, causes an inaudible increase in the Micro tremor's frequency. Micro tremors are tiny frequency modulations in the human voice. Embraced by the Department of Corrections, the system has also proven itself a very reliable investigative tool for verifying statements of witnesses, denials of suspects, and for determining the validity of allegations made against police officers. The CVSA® is effective in all investigative situations such as homicide, sex crimes, robbery, white collar crimes, and internal affairs investigations, as well as pre-employment examinations for background investigators. Unlike the polygraph, drugs do not affect the results of the exam and there are no known counter-measures that will cause the ubiquitous "inconclusive" results associated with the polygraph. As the subject speaks, the computer displays each voice pattern, numbers it and saves each chart to file. The CVSA ® uses only a microphone plugged into the computer to analyze the subject's responses. ![]() ![]() ![]() ***Unlike the computer polygraph, the CVSA ® requires no wires be attached to the subject being tested.
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