Hi I'd like to share my experiences with PC polygraphs so far. A little history about my conviction, I was downloading porn using a file sharing software, ignorant of the risks involved and lacking knowledge about the software I was using. I accidentally downloaded a child pornography file the police were tracking. Once I previewed the video I immediately stopped it and deleted it from the que. Little did I know that the 25 seconds worth of video I downloaded before deleting it from the que left an incomplete file of it in the software's folder it created when I downloaded the software. I was arrested for possession of child pornography even though I had no other illegal files or pornography on my hard drive. I had no other choice but a plea deal for misdemeanor possession which I would serve 5 years probation but I would be eligible for a probation before judgement after 3 years if I complete therapy and don't download child pornography again. The latter being very easy. The first polygraph I had I passed because I had read the book from this site but still answered truthfully to everything. I was mainly just trying to identify the control questions and other things the book points out. 

The second test I had, I decided to lie on the 2 out of 5 questions I was asked that didn't pertain to my case or seem very important. The first question was (paraphrasing) "Do you think about attractive women you see in person in a sexual way?" I answered no, but if I see a hot woman, my instinct kicks in and I like to imagine what they look like naked. The second question was "Do you ever talk bad to other people  about your probation agent?" I answered no but of course I do. He's an asshole about a lot of unnecessary things to be an asshole about. 

Anyhow I came back non-deceptive on all questions. I just made sure my breathing was perfectly steady throughput the 3 different tests of the same 5 questions. That was all I focused on, even counting it out in my head, "in 2,3, out ,2,3" etc the whole time.

Yup one file. They showed up with a warrant. They showed me a printed picture of the file and I remembered it. I remember previewing it, freaking out, and deleting off the download list. I told them that and they didn't care. It sucks but at least I have a chance to get it off my record and get off the registry.