Three body language analysts studied two recent Roger Clemens interviews about his alleged steroid use and found that maybe he's not telling the whole truth.
In the "60 Minutes" interview, for example, the analysts noticed that Clemens swallowed hard, looked down, and licked and pursed his lips when answering questions - all signs, they said, that he might not have been telling the truth. "That's indicative of deception, that's indicative of stress," said Joe Navarro, a retired F.B.I. agent who trains intelligence officers and employees for banks and insurance companies.
The article also notes that these experts are only right about half the time and that the technique is used as a tool to evaluate if further investigation is warranted and not to determine truth.