OF THE
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A polygraph not a lie detector; it never was. A polygraph detects physiological expressions associated with lying in some people, such as a racing heart and sweaty fingers. The determination of truth vs. falsehood is a subjective interpretation by the polygraph examiner.See also:
Not surprisingly, the examiner is often wrong. The anxiety associated with "oh no, they will detect that I'm lying" is rather similar to "oh no, they're going to think I'm lying when I'm not."
Comment: We can only pray that the congressman won't get the chance to follow His Holiness to the toilet.