Hello Shehzaad,
Thanks very much for your comments, you have identified the very point I have made from the beginning of this series of articles on lying/deceit behaviors.
Please check out the entire series of these articles that I have been writing - as you have hit on the very point I have been trying to make. People, even trained professionals, are no better than chance at detecting lies based solely on behavioral cues. That is a point I have made from the very beginning and thank you for highlighting it.
With smiles,
Jason