A Study Testing the Validity of Truster Voice Analysis Technology in a Criminal Field Context
Author: John Joseph Palmatier Ph.D.
Sponsoring Agencies: Michigan State University , Michigan State Police and the US Navy

Subjects scheduled for criminal polygraph examinations gave their permission for the recording of their responses to questions asked during the examination, and these responses were analysed using Nemesysco VRA technology (TrusterPro). 100 subjects were used, 25 truthful control subjects, 50 deceptive, and 25 truthful subjects, their status confirmed by either the examinee or another person confessing to the crime at issue. The voice analyst achieved results of 89% accuracy for truthful subjects and 78% accuracy for deceptive subjects. He concluded that these results, along with the others, and the versatility of the product strongly suggests that additional research is needed to explore this ‘new and perhaps promising technology in multiple settings'.

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Investigation and Evaluation of Voice Stress Analysis Technology
Authors: Darren Haddad; Roy Ratley; Sharon Walter; Megan Smith
Sponsoring Agencies: US Dept of Justice & National Institute of Justice United States
Publish Date: 13th February, 2002

This report presents the methodology and results of the testing and evaluation of two voice stress analysis (VSA) systems that claim to be able to detect stress, possibly indicating deception, in voice communications. In response to inquiries by law enforcement officials about this technology, this testing and evaluation was conducted by the US Air Force Laboratory. The evaluation was conducted in three phases.

In the first phase, Dr. John H.L. Hansen Research investigated the feasibility of detecting stress from speech. The second and third phases of this study investigated the reliability of two commercial VSA units, including Nemesysco's TrusterPro,, from both a theoretical perspective and from an application (i.e. law enforcement) perspective. The theoretical evaluation concludes that TrusterPro does recognise stress through voice analysis. Due to the lack of deceptive stress data available, classification of deceptive stress versus emotional stress or physical stress could not be tested. On the Law Enforcement side. the report contains a testimonial from a serving U.S. Police officer using TrusterPro who cites a success rate of about 97% on tests vs. confessions. He concludes that TrusterPro is capable of becoming a valuable investigative tool.

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The TrusterPro Technology Reliability Test
Author: Shlomo Bruck
Sponsoring Agencies: Israel Polygraph Examiners Association and the American Polygraph Association

The experiment consisted of a group of 60 individuals in a controlled situation. A mock crime was staged with the subjects creating a situation whereby there were ‘guilty' subjects and ‘innocent' subjects. Each subject was examined by 5 polygraph examiners, and then interviewed by a TrusterPro examiner. He concluded that TrusterPro ‘offers a degree of reliability that indicates that the developed instrument is suitable for field work.'

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