Liars usually don’t have very good cover-ups for their stories, because they have to come up with a fictional tale on the fly.
If they had nothing to hide, why would they get angry about you interrogating them?
Look out for these sudden subject changes, because that’s your chance to really dig deep and ask them tough questions.
They will shy away from hugs or handshakes, and will keep a sizeable distance between the two of you.
This serves as a form of protection for them, because they don’t want to get too relaxed and accidentally reveal too much information.
People who tell the truth will act calm when put on the spot, and will offer logical explanations about their behavior.
Meanwhile, liars have to deal with all the turmoil they’ve created, and must justify it to avoid caving under all the guilt.
For example, maybe you feel that your friend stole money from your wallet when you set down your purse to throw something away.
While you can’t really prove it, you remember taking 0 out of the bank, and not being able to find after hanging out with her.
Even if they add or revoke small details, this further proves that their original story had no merit.
They probably forgot most of the tale they told since it never really happened, which means they can try and confuse you more with additional fabrications.
Liars tend to not smile as much as people who live authentically and tell the truth no matter the consequences.