The behavior of a lying person is always different from the behavior of a sincere person. A small detail, sometimes noticeable only to an experienced psychologist, will nevertheless betray the deceiver, no matter how disguised as it may be: it can be facial expressions, pantomimics, postures. The look of the interlocutor can also tell if he is telling the truth.
Instruction manual
one
If a person is lying, then fraud can be recognized. There will still be small discrepancies between words and gestures (including expression of the eyes), though it will be difficult to distinguish between them. The main thing is to determine whether the interlocutor has any preconditions for lying and suspicion.
2
The first sign of a lie is averted gaze. But this is not an absolute indicator. Some people, even with ordinary, sincere speech, do not look at the interlocutor, but turn to the side, it is easier for them to find words and gestures. Such people, by deceiving, on the contrary, can look into your eyes and look even with some challenge.
3
Change in eye expression. As a rule, a lying person is still afraid to be revealed, hence the slightly frightened expression. However, do not confuse the fear of disclosing fraud and the usual embarrassment of a stranger or an unusual situation.
note
Eyes are not the only indicator of lies. When analyzing behavior, look at the full picture: gestures, facial expressions, posture. Analyze all the information about the person you know: do the words correspond to what you know and what you see?