The claim is often made by people of varying credentials that humans are able to spot lies and determine dishonesty in other people through simple observing of body posture, facial cues, eye direction, etc. i.e.: Body language.
People like Pamela Meyer (who even gave a TED talk about the subject) have turned this into a business and sell books, seminars, etc. about the subject, and make the claims that theirs is a reliable method for becoming a human lie detector.
So, my question:
Is there any scientific evidence to support the claim that untruthful statements can be detected, by observing body language alone, with any degree of accuracy? And, related, how accurate (if this is applicable) is the detection rate of claimed experts/professionals.
In other words, if I were to wear a coat that hides my shirt and said: "I am wearing a blue shirt underneath this coat.", is it possible, through my body language alone, to determine if I am telling the truth?
Note: I am not referring here to analyzing a statement for inconsistencies, which may reveal a lie. I am only talking about detection of lies through body language.