Like – if it’s based on a person’s physiological responses, isn’t it possible that a response to a question like “did you murder your hamster” would register as a lie due to the increase in heart rate and blood pressure cause of anxiety associated with being accused of something?
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Polygraphs are mostly nonsense; they simply test “stress” – and even then it’s interpreted by the examiner.
The only thing they really do are make guilty people feel scrutinized, with the hope that they’ll confess under the pressure.
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