--- title: "Write the scientific name of lie detector which uses by the police for proving lies?" description: "Write the scientific name of lie detector which uses by the police for proving lies?" author: "simron shukla" published: 2018-02-28 canonical: https://answers.mindstick.com/qa/35533/write-the-scientific-name-of-lie-detector-which-uses-by-the-police-for-proving-lies category: "general knowledge" tags: ["general knowledge"] reading_time: 3 minutes --- # Write the scientific name of lie detector which uses by the police for proving lies? ## Answers ### Answer by Shreyas Tandon A polygraph, popularly referred to as a lie detector, measures and records several physiological [parameters](https://www.mindstick.com/articles/87/passing-parameters-in-c-sharp) such as [blood pressure](https://www.mindstick.com/articles/311289/high-blood-pressure-symptoms-and-testing), pulse, respiration, and skin conductivity while a person is interrogated. The instrument typically used to conduct polygraph tests consists of a physiological recorder that assesses three indicators of autonomic arousal: heart rate/blood pressure, respiration, and skin conductivity. Most examiners today use computerized recording systems. There are, however, no specific physiological reaction associated with lying, making it difficult to identify factors that separate liars from truth tellers. Polygraph examiners also prefer to use their own individual scoring method, as opposed to computerized techniques, as they may more easily defend their own evaluations. Rate and depth of respiration are measured by pneumographs wrapped around a subject's chest. Cardiovascular activity is assessed by a blood pressure cuff. Skin conductivity (called the galvanic skin or electrodermal response) is measured through electrodes attached to a subject's fingertips. ![Write the scientific name of lie detector which uses by the police for proving lies?](https://answers.mindstick.com/questionanswer/31a6359d-dca5-4e14-b916-5901fbc32936/images/8eaaa9db-d60a-4d4b-9ff6-4d3f3061f8cb.png)\ The recording instrument and questioning techniques are only used during a part of the polygraph examination. A typical examination includes a pretest phase during which the technique is explained and each test question reviewed. ![Write the scientific name of lie detector which uses by the police for proving lies?](https://answers.mindstick.com/questionanswer/31a6359d-dca5-4e14-b916-5901fbc32936/images/5d924bdb-d90a-4a53-a8c8-cf6d276173d4.png)\ The pretest [interview](https://www.mindstick.com/articles/329061/video-interviews-a-viable-tool-to-take-on-large-recruitments) is designed to ensure that subjects understand the [questions](https://www.mindstick.com/blog/124895/hp-hpe0-s54-cheat-sheet-exam-questions-bank-for-guaranteed-success) and to induce a subject's concern about being deceptive. Polygraph examinations often include a [procedure](https://www.mindstick.com/blog/304484/explain-the-sql-stored-procedures) called a "stimulation test," which is a demonstration of the instrument's accuracy in detecting deception. In some countries, polygraphs are used as an interrogation tool with criminal suspects or candidates for sensitive public or [private](https://www.mindstick.com/interview/75/a-constructor-can-be-private-true-or-false) sector employment. US law enforcement and federal [government](https://www.mindstick.com/news/1911/upi-transaction-would-cost-zero-service-charges-clarifies-government) agencies such as the FBI, NSA[3] and the CIA and many police departments such as the LAPD use polygraph examinations to interrogate suspects and screen new employees. Within the US [federal government](https://answers.mindstick.com/qa/41815/what-2-things-did-the-federal-government-do-to-encourage-railroad-construction), a polygraph examination is also referred to as a psychophysiological detection of deception (PDD) examination Several questioning techniques are commonly used in polygraph tests. The most widely used test format for subjects in criminal incident investigations is the [Control](https://www.mindstick.com/articles/137/asp-dot-net-ajax-control-toolkit-calendarextender) Question Test (CQT). The CQT compares responses to "relevant" questions (e.g., "Did you shoot your wife?"), with those of "control" questions. The control questions are designed to control for the effect of the generally threatening nature of relevant questions. Control questions concern misdeeds that are similar to those being investigated, but refer to the subject's past and are usually broad in scope; for example, "Have you ever betrayed anyone who [trusted](https://www.mindstick.com/interview/863/which-one-is-trusted-and-which-one-is-untrusted) you?" \ --- Original Source: https://answers.mindstick.com/qa/35533/write-the-scientific-name-of-lie-detector-which-uses-by-the-police-for-proving-lies Copyright © MindStick Software Pvt. Ltd. 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