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Any other negotiators, psychologists, cops, poker players pick up on this?

There is actually a quite a bit if research into facial expressions and detection of honesty.And the only really reliable measure of an expression’s general emotional basis is looking at really complicated and precise combinations of micro expressions, and there is an extensive coding system called the Facial Action Coding System (FACS) that requires significant training to even begin to learn, and is probably better handled by computers anyways.And even after all of that training there are only a couple distinct expressions that can reliably indicate dishonesty, more reliable than polygraph but far from perfect and still doesn’t indicate the why of it when it is accurate.In other words, unless someone is just flat out terrible liar or one has observed that person extensively and had an objective standard to identify lying (like probabilities and results in poker), then maybe the most reliable measure of a liar is the person who says they can identify a liar from some random facial expression.