The Truth About Polygraphs: The Science and Limitations of Lie Detectors

Polygraphs, first used in 1924, are based on the theory that lying triggers physiological responses like increased heart rate and perspiration. Devices measure these responses during questioning. The Control Question Test compares responses to control and relevant questions. However, polygraphs lack scientific evidence for unique lying patterns and are only about 75% accurate. True guilt is best proven by admission or evidence.

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