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Lie detector Test is a method which can be used to ascertain whether a person is telling the truth or not. The most common lie Detection technique is using polygraph which examines the behavioral and stress levels of the person in question to decide whether they are telling the truth or not. Lie Detection technique remains an imperfect science at the moment and many studies suggest that success rate is somewhere around 70 to 80 percent as many people can lie upon without showing any changes in their mental or physical behavior.
History of lie Detectors
The study in deception testing started in the 1900’s and was pioneered by Benussi, an Italian scientist. He found the abnormality in psychological tests and varying rates of emotional disturbances coinciding with a person lying or trying to hide something. His discoveries were picked up by other eminent psychologists and this led to the development of polygraphs, which were widely used by intelligence agencies during the course of the Second World War to interrogate spies and verifying their information.
Use of Lie Detection in the Current world
Though not exactly accurate, Lie Detector Test UK are used widely all around the world in law enforcement agencies, intelligence community and by private investigators. The most widespread usage though is in the United States where polygraphs and other techniques are used quite massively. Many countries don’t use this science to ascertain the guilt of any person as this is not a perfect result providing study.
Other than polygraphs, many other methods are also associated with lie detection. These methods are also used constantly though not at the same magnitude as polygraphs as it has been the most worked upon branch in this area. Some popular techniques for deception testing are listed below:
- Cognitive Polygraph Tests
- Event-Related Potentials (ERP)
- Electroencephalography (EEG)
- Eye Tracking technology
- Voice Risk Analysis
- Functional Magnetic Resonance Imaging
- Functional Near Infrared Spectroscopy
- Non Verbal Behavior Observation
Apart from these techniques which are study based, many drugs known as truth serums are also used by varying levels of intelligence communities such as the FBI and CIA. They use drugs such as sodium thiopental, ethanol, cannabis and LSD to induce mind altering affects on the test subject and so that they could not deduce the difference between fantasy and real world. This give the examiners more scope in getting answers they could not expect from a stabilized person in question.