As another reviewer pointed out, this is nothing more than self-described "experts" pointing at behavioral characteristics and claiming that they are somehow indicative of lying when the subject has already been exposed as a liar. In one case in the first series one of the "experts" actually engaged in the very behavior they claimed indicated lying *while they were saying the subject was a liar*!
It's well known to any investigator worth his/her salt that people behave differently and react to stress differently. Italians are well known for talking with their hands-- does that mean all of them are lying all the time? Of course not!
This isn't science by any stretch of the imagination-- it's the opinion of snake oil salesmen who would be working carnival sideshows if they hadn't scammed their way into a television show. Just as with bite mark analysis & hair analysis, these interpretations of behavior are highly subjective and are certainly not scientific.
Two points because some of the stories are interesting to those of us who haven't heard them before but minus 10 points to the so-called experts for their laughable, transparently bad "analysis".
