Polygraph. Voice Analyzers and Forensic Testing
The use of polygraphs, voice stress analyzers, and forensic testing in sensitive areas, such as the questioning of suspects in criminal cases, recruitment processes (e.g. by the FBI), investigation of insurance fraud and interrogation of current or potential employees raises certain ethical issues. In particular, the appropriateness of compelling, or coercing people to undertake such testing needs to be examined. The use of polygraphs also raises the broader question of whether we want to live in a society that is dominated by these types of testing. Voice stress analyzers, unlike polygraph, are 98 percent accurate. These devices are so efficient and accurate, that many government agencies now use them. The major problem today in our criminal justice system is prosecutorial misconduct, consisting of hiding information to prosecuting those known to be innocent. The latter results in some 20 percent of our two million-inmate populations having not committed any crime. Despite this inherent difficulty in the relationship between psychology and the law, the forensic psychologist can assist a court or an investigation by giving an expert opinion on aspects of behaviour that will increase the probability of the outcome being correct; (
" Henderson police said in court filings that the arrest was based on evidence other than the CVSA results. Police departments across the country are buying the controversial Computer Voice Stress Analyzer, which its manufacturer claims, can tell "when a person is lying merely by the sound of his voice. The preponderance of authority in the United States is against the admission of polygraph evidence with a variety of grounds having been asserted for refusing its admissibility. It can also be used in the field, covertly, and on tape recordings, according to the National Institute for Truth Verification of West Palm Beach, Fla. Subsequent opinions (in areas other than the polygraph) have tried to better define that line between "experimental" and "demonstrative" stages of a scientific innovation. It intrudes on the ultimate issue, which the Court must determine. " When a suspect speaks, a computer program "listens" for minute vocal shifts that, in theory, indicate stress. Based on this study, the Department of Defense, the Central Intelligence Agency and the Federal Bureau of Investigation do not use voice stress tests. Marston determined, on the basis of this test, that Frye was truthful when he denied involvement in the robbery and murder. Lykken, a psychology professor emeritus at the University of Minnesota in Minneapolis and author of the book "A Tremor in the Blood: Uses and Abuses of the Lie Detector. In other words, guessing or flipping a coin would be as accurate as the test. Central to legal, legislative, and scientific assessment of polygraph tests is their validity. , man had never heard of a voice stress lie detector. are inadmissible as substantive evidence.
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Acceptance Essays
