This is very important. The Leak Do not mention people who will back you up unless they are in on your scheme, or you will be exposed in no time. You don't have to know someone particularly well in order to read their non-verbal signals like a book. Although figuring out whether your close friend is lying is a lot easier than scrutinizing a perfect stranger, it's a possible task with some basic knowledge of body language. I either laugh or have a huge breakdown when I try to lie.
Liars often reveal their lies through uncontrolled body language.
Watch for people rubbing their noses, touching or scratching their faces, and nervous twitching and body movements like pacing, rocking and tapping. Most liars avoid looking straight at you when fabricating their story. Mumbling is an obvious sign of low confidence and a lie if the speaker does not mumble often. Any change in the normal tone of voice and mannerisms should also sound alarms. Of course, it is impossible to list all of the ways to detect a lie because each person is unique.