Sometimes what we think we know about body language and lying just isn't true, experts say.
Shifty eyes: If someone isn't making eye contact or looks to the left or right when telling you something, it doesn't mean he is being deceitful. Often it just means he is thinking carefully about how he chooses his words.
Maintaining eye contact: Strong eye contact can mean a lot of things flirtation or an attempt to exert dominance, for example. But it's not usually a sign that someone is lying. Unless, of course, he happens to believe liars look away when they talk.
Nervous yawn: This could mean someone is hiding something, but could also mean he is just nervous.
Emphatic denial: A denial that puts stress on every word is often a sign of condescension, but it is not a sign of deception.
Fidgeting: It's usually a sign of nervousness or discomfort, not lying, and it's often done by innocent people who are under suspicion.