In doing so, the examiner can gauge your physiological responses to lying by reviewing the questions he or she knew you lied on. And he knows he failed on at least one question when asked whether he was "withholding any information in regard to Jacob's case." The polygraph measures autonomic responses, "and that is all it is measuring," Littlefield said. Polygraph screening comes in three phases and averages about four hours, but the actual time applicants spend attached to the device answering questions is limited to 10- to 15-minute intervals. As a result, the lie detector won't be able to tell which questions you're genuinely reacting to, since you'll be reacting to all of them. Eric holds a BA in English from the University of Illinois at Chicago, and an MEd in secondary education from DePaul University. It's difficult to definitively assess how well lie detectors work because there are many definitions of deception and many ways of measuring the results, including those deemed "inconclusive." The polygrapher may try to trick you by mentioning certain technical terms and acronyms such as, Your test came back NDI. While you will know that NDI means no deception indicated, just act as though you have no idea what it means. Often times prospects are disqualified because of an inconclusive result. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. For more information, please see our Don't dwell on things that happened or people you . Irrelevant questions are those that are obvious, such as What is your name? or, Are the lights on in this room? Theyre finding your truth response. It measures your physical responses to factual questions; increased heart rate, increased respiration or perspiration can indicate evasiveness, nervousness, or deception. To create this article, 12 people, some anonymous, worked to edit and improve it over time. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. They include Gary Ridgway, known as the Green River Killer and the Russian mole Aldrich Ames, who used so-called "countermeasures" to beat polygraphs twice in the 1980s and early 1990s. I assume that it's something along the lines of another investigation akin to my initial investigation, if it even gets that far. They are considered by many in the scientific and legal communities as only marginally more accurate than coin flips.
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