some people cannot look you in the eye, excessive hand gestures...these are the ones I know about.
body language , i became an expert now , but some people really professional
natural intuition- something no one can hide from
A true sociopath can lie to you face to face without bl<x>inking an eye.
Eye movement away from you to side, slight increase in forehead reflectivity, hand wanders to face or scalp. Clearly sometimes their scalp itches. Plenty more signs
How their eyes dart up and to one side while their brain tries to think of the next lie.