I just picked up MW2 since a good friend wanted to do some co-op. This thread over at the Steam Forums says Valve has released an under-the-radar VAC update. Sounds like a decent amout of hacking has been curbed for now, but I don't have any past online experience with this game to verify.
http://forums.steampowered.com/forums/showthread.php?t=1227937
forgot to screenshot, but people were doing a pot deal during a game. somebody in upstate new york wanted to buy a pound of weed.
I thought the smoke grenades "joint mass inc" is where it's at.
[M]http://www.youtube.com/watch?v=PYC6i9Xod40&feature=player_embedded[/M]