It's probably that.. Remove your old posts containing illegal materials and wait for atleast a month and then reapply. It's getting pretty difficult to get in on Adsense these days.
The google program is pretty tight. They make sure that you are legit and they did the same thing to me. I tried to get the program on my site. I was not activated. The reason I later found out after calling google was that my site had a problem in the script. That was an odd reason to deny me I thought but it was something to de with the safety of my site. I dont know but that was my answer from google. Try calling them and see what they can do for you. Many people are talking about this problem on another forum freelancersforums.com they are cool there but this one rocks. digital point is so cool...
u can open a new blogspot, keep posting content like 4-5 times a week, after 2 -4weeks. you can use it to regisitor the adsen accs and since ur IP or info that you have been use for many times, they might put it in black list so you can use difference info, but that can contact you and if possible, you can use difference ip as well to open the blog and adsen acc see if it works.
make a separate page and write below statement, then apply with that page which u created, hope u will get approval: "This post confirms my ownership of the site and that this site adheres to Google AdSense program policies and Terms and Conditions."