First, you need to understand that polygraphy has no scientific basis. It's a pseudoscientific fraud. Don't let your polygraph operator make his polygraph suite into a Catholic confessional.

The things you discussed here are not responsive to any relevant questions in a law enforcement pre-employment polygraph interrogation, and it would be foolhardy for you to mention any of these things to a polygraph operator. They are precisely the sort of thing that can, and may well be, spun into a disqualifying admission.

Okay, I hate doing this, but I really want to become a police officer and I don't know if I should even try because of what I did almost 20 years ago. So here it goes...

I was babysitting a girl who was about 8 and I was 11. I gave her a back massage, and when doing so, I touched her chest a few times. Also, around the same time, I pressed another eight-year-old girl against my thingy while swimming in a pool together. We were both wearing swimming suites, so no actual penetration or touching happened, but I was "dry humping" her for a while. Neither girl knew what I had done...I was just a horny kid hitting puberty and not knowing what to do about it.   

I have never done anything like this again, but there is one thing that bothers me that happened when I was an adult.

When I first became a father, about 10 years ago, I was changing my daughters diaper, and for a split second I thought about touching her vagina in a sexual way. I noticed she liked it when I cleaned her in a certain area, and that made me think of it. I quickly thought, "that was really sick of me to think something like that," and I DIDN'T do ANYTHING. Now it has been many years, and I've never done or thought anything like that since. But just the thought that I had for a split-second makes me feel guilty and ashamed, so I feel like I could fail the poly because of my guilty feelings over the whole thing. 

Maybe this is stupid because I HATE pedophiles, and I know that I'm not one, but I'm afraid the poly could show my feelings of fear and guilt as lies.   

Other than that, I feel like I have a very good changes of making it. So please let me know what you think. 

Thank you.