Beating the system...
This sounds a lot like that situation of the Chess Master playing Deep Blue (Or whatever the current iteration of Chess Machine is). The Master deliberately set up a situation where the Machine would predictably perform a certain move which was a set trap by the Master. It took human intervention on behalf of the Machine to overcome this obstacle.
I assume (not being an expert in such matters) that simply playing haphazardly and not sticking to a definable routine would fool all of these systems, for instance Folding on high value hands.
Maybe they should link it up with the National Criminal Database and look at the shifty photos of cons to compare facial expressions?