I have a tag on my account that says I'm not cheating. If you get enough gm reports a GM will investigate - once they question you and everything goes well - assuming your not cheating they will tag the account. If they don't tag it or say nothing, request and they can. I haven't had a tell from a GM in 1 1/2 years, and I know I get reported many times a day from what I can do in PvP.