Did you even blow up 1/4 as much as you just did hear. Because if you did, I guarentee you that is why you just got punted. The polygraph is a tool of interogation. It's is routine that they will come back in and say you show deceptive just to see if you will reveal anything else. If you blow up and go off on them, you got booted for you personality and how you deal with stress, not the polygraph.
Yeah, it's a mind game to get you to reveal the secerets that even you own parents don't know. The machine means nothing, it's all about attitude and the person doing the interrogation.
Excuse me Officer, I have a stupid Question. "No problem, I've got a stupid answer for you!"