Cheating in one of the following Source games will result in a VAC ban for all games in the list and your items from Team Fortress 2 will be removed except any items that have been purchased:
Half-Life 2: Deathmatch
Day of Defeat: Source
Team Fortress 2
Cheating in one of the following Gold Source games will result in a VAC ban for all games in the list:
Day of Defeat
Team Fortress Classic
Excluding the games listed above, VAC bans will only apply to the game the cheat was detected in. For example, a VAC ban in Modern Warfare 2 will not affect Modern Warfare 3.