I'm listening and so far...this is such fear mongering...ugh.
But...my take on what she is saying that she is not speaking specifically to people trained in body language and lie detection. She is referring to the average person who relies on intuition alone or who allows their experience to lower their defenses by being over confident.
When she talked about animals and babies being con-artists...I think she was completely over-reaching with that term. A baby crying as a way to get picked up is not an act of conning nor deceit. It is a form of communication. In the case of the ants it sounds more like it is a technique of survival. For the dog..a communication technique to have a need (affection is a biological need) met. I don't know that you can label them conniving... Exerting persuasion does not equal conning.
Back to your original point... the way around not doing what he is saying is to avoid lensing. The point in lie detection is to NOT make assumptions but to use clues to know where to probe further. If you make blanket assumptions based on what you assume someone's body language cues mean...then you are doing it wrong. Its a tool. A means to an end...not the end itself. IMO.