I am watching Penn and Teller Bullshit this morning while I wake and bake and I do have to say this is one of the best I have seen. This one is about how inaccurate the polygraph test is and they have an army veteran, police certified polygraph examiner. He explained that since the sphincter (asshole) muscle has so many large blood vessels around it, if you "flex" it just at the right time for about 3 or 4 seconds, it looks like you are telling a lie.
So basically on everything you are telling the truth about you flex to get your vitals up then when you are lying, you relax. He said even if they don't just pass you at the end it makes it all very confusing.
So basically on everything you are telling the truth about you flex to get your vitals up then when you are lying, you relax. He said even if they don't just pass you at the end it makes it all very confusing.