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A lie detector test, also called a polygraph test, is an examination that measures and records physiological responses—like heart rate, blood pressure, breathing rate, and skin conductivity—while a person answers a series of questions.
The idea is that when someone lies, their body reacts with small changes caused by stress or anxiety, which the polygraph can detect. During the test, the person is asked control questions (where the truth is known) and relevant questions (about the issue being investigated), and the examiner compares the responses.
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