The Pro said:This isn't a question of can you be, you *will* be suspended if you modify your gamertag.
I recommend anyone thinking about modding/hacking/doing other uber l337 stuff take a moment, put down the controller, and ask yourself if this is really worth it. Punishment for system tampering include but are not limited to permanent suspension of your account and your console from Xbox Live.
a modern warfare 2 gamertag will get you PERMANENTLY suspended. it happened to my first GT (Absolutely Grim)
check mark = my infringements
if i didnt have a modded GT i would have been reset