I took my first "test" ever recently and completely bombed it. Long story short my girlfriend suspects (and is now completely convinced) that I cheated on her so I willingly submitted to a polygraph. 500 bucks. Ouch. I get strapped in, given a very long speech about his credentials and history, and a very nonstressful set of control questions. The numbered cards. Then the test starts and when he asks if I've "attempted to facilitate sexual relations" I felt my skin flush and the room started spinning. I realized I had flirted and i later admitted to having other desires, but I thought we were only talking about actually going through with cheating or making attempts to cheat (which I did NOT do or even come close to). Then I noticed he kept letting out these deep sighs every so often and I could feel my heart racing the ENTIRE time. I still felt safe though since I never actually cheated or had any secretive contact with anyone, though because of weeks of constant accusation I answered those questions a little angrily. So he comes out with the results and proceeds to tell me I failed almost as badly as I possibly can. That bastard actually said he's tested KILLERS that do better than I did! I know I lied but not about everything, and now my life is in shambles, I'm out 500 dollars, and the mother of my child is talking to another man who she knows is interested in her. These things are SICK. Keep away.
I can only say what I would do if I were in your shoes-- accept the $500 loss, forget about the jerk polygraph operator, find a different girlfriend, and be loyal to her. Oh, and get the nut tubes capped and stowed--child support for one is enough.