Quote:
Originally Posted by Target
Are they also likely to smile, grin or sometype of smirk?
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Depends. Sometimes the prospect of getting away with it produces a thrill and the urge to smile. Other times smiling is an automatic behavior which conceals the weakness of nervousness and to a lesser extent sometimes guilt.
Again it all depends! The particular circumstances behind the lie and the individual nuances of the alleged liar's personality are what makes this kind of behavioral tell and reliable or not.