1. Look for Facial Expressions
The face reflects a person’s true personality. Happy or sad, you can tell by his face. When people lie some micro-expressions appear for a fraction of a second and reveal the person’s true character.
2. Prolonged Eye Contact
Liar usually avoids eye contact or just make a prolonged eye contact to get your trust and to convince you that what he is saying is true
3. Notice Body Language
Liar usually uses his hand to touch his nose, comb his hair, pull up his socks, wipe away sweat, tug on his clothes or rub his lips when he's lying about something because its human nature to feel uncomfortable from the inside when lying
4. Establish the Baseline
Before looking for particular clues to catch a liar, it is important to set a baseline. A baseline reveals how a person behaves in normal circumstances. This can be done by asking some simple and basic questions to which you already know the answers. People normally answer these questions truthfully, and you can note the behavior and mood to establish the baseline.
5. Notice the Pause
A Liar may take a long pause so that he can create a sequence of events whenever he's ask a question or doubt in his story and he isn't prepared to answer.
6. Check for Sweating
People sweat more when they lie. Because it is very stressful when you lie so a liar will start sweating and It is one of the major indicators that a person is lying
7. Inconsistencies in the Story
Even if you have the slightest doubt on a story, ask him to repeat the story after asking a couple of things in between. If the person is lying, he might add/remove a few details of the story. Any deviations in the story could indicate that the person is lying
8. Proclaims Honesty Repeatedly
“to be honest”, “believe me”, and “to tell the truth”
are the statements which the liar uses when lying to convince you. A liar often repeats phrases to emphasize the validity of his statement
9. Excessive Lip-Licking
Excessive lip-licking is a common sign of dishonesty. When a person lies, it puts a lot of stress on his body, which can result in repetitive physical behaviors
10. Changes in Voice or Tone
Closely observe the voice or tone of the person you think is lying. Changes like slower or faster-than-normal speech patterns indicate dishonesty