A lie-detector test does not conclusively prove that the person is being untruthful and as such the results of this test are not treated as evidence in Indian courts.

It is a device often used during criminal investigations for questioning suspects. But how does it work?

A lie-detector or polygraph is a device that monitors a person’s involuntary physiological reactions when he or she is questioned about a certain event. The instrument tries to find out if the person is trying to conceal something. It is often used during criminal investigations for questioning suspects. A lie-detector is essentially a combination of a variety of medical devices that monitor changes occurring in the body during questioning. The examiner looks for important reflex actions of the body when the person is subjected to stress, by monitoring fluctuations in heart rate, blood pressure, respiratory rate, etc.

Based on these indications, the examiner can at best interpret if the person is being deceptive. But a lie-detector test does not conclusively prove that the person is being untruthful and as such the results of this test are not admissible in Indian courts.

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