He is not your typical polygraphie...
My point is that the average person is not equipped to trick the polygraph, even if they download all those nice little 'how to' guides from the internet.
I guarantee you those guys in question (in this post) are no Aldrich Ames. Additionally, I never said rely on it solely. It is simply one important tool amongst many.
If you did an actual scientific study of it you'd find that it was nothing like 99% acurate. It's junk science.