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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They don’t. Which is why they aren’t accepted as true lie detector tests.
They’ll have you answer spare questions to calibrate the test. But even still, this doesn’t work 100% of the time.
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