WOW you people really really annoy me. KAZAA ISNT ILLEGAL. Sharing copyrighted files without a licence to do so is illegal. Hmm, I'll describe it in terms that you might be able to understand. Lets say you own an axe. The axe is just a tool, like Kazaa. Nobody can arrest you for using an axe to chop your own wood. But, if you use the axe to break someones mailbox, you've committed a crime. Get it now?
2. YOU CANT GET ARRESTED FOR USING/HAVING KAZAA. Read above. Even if you were caught spreading copyrighted files, you aren't going to get arrested. Why? Because its a CIVIL LAWSUIT, not a CRIMINAL LAWSUIT. Its between the RIAA and you, not the government and you. The government is merely an intermediary between you and the RIAA.
So, before anyone even bothers to reply to this, DO SOME RESEARCH. Remember kids, Google.com is your friend.