I lied and passed. Read the "Polygraph is a fraud" thread in the post-conviction forum.

How many times do you have to bend over because of the polygraph? I never lied about what I did and stood up to take my licks for it. After being "consequenced" and "sanctioned" for being scored inconclusive and deceptive by charlatan polygraphers, I felt I needed to take proactive measures to protect myself from the polygraph clown show. On my last polygraph, I lied about having viewed pornography (saw some in junk/spam email). I used countermeasures and passed.  After bending over backwards detailing every incidence of contact with minors, for example, and then being scored deceptive about having had sexual contact with anyone other than my wife, and then being punished for something I didn't even do, yeah, my attitude went south and it was time for a healthy F-you to the polygraph community. 

Like many others who have been screwed by the polygraph - for whatever reason(s) one is having to take it in the first place - you can only begin to appreciate the fury of being judged a liar when you know goddamned well you told the friggin truth.