Good signs to look for are long pauses or frequent pauses in speech. This means that the liar is not sure where he's going with the story or maybe he can't follow through with the lie. When liars are hesitant at the start of a sentence, especially when responding to a question, it means that he hasn't worked out the story yet, or he didn't anticipate that question. Liars are easily detected through body language. Our face displays all kinds of emotions.
Liars are especially prone to the tensing of muscles around the mouth and cheek area.
The mouth narrows and a lot of the time liars bite their lip. A split second frown or look of disbelief can quickly be replaced by a fake smile to cover up any sign that a lie is being told. Shrugs can be translated as helplessness. Shrugs are usually used when a liar is caught without a good explanation or is at a loss for words. Scratching of the arms, fake coughs, swallowing, red cheeks, the twisting of rings, or fidgeting around are all signs of discomfort.