"Well, this news from XBOX Live head of Policy and Enforcement, Stephen Toulouse AKA ‘Stepto’, is music to our ears. In a post on the official Xbox forums The Pro addresses the cheaters with a clear message that people who have obtained prestige in Modern Warfare 2 illegitimately, will be given suspensions from Xbox Live. The guys running these lobbies will be permanently banned."

source: The Pro @ xbox.com »
ATTENTION MW2 CHEATERS (and you know who you are)

People who have obtained prestige illegitimately, will be given suspensions. People soliciting other people to gain prestige (whether for free, or for points) will be permanently suspended.

To all those users who are attempting to play MW2 without cheating, please have faith. Hang in there, because the cheaters are being caught and the game will be patched.

p.s., it doesn't matter if you gained 10th prestige, 2nd, or 1st: illegitimate gameplay = suspension