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VAC Enabled Games

Please see the Steam Store Valve Anti Cheat Enabled search term.
Valve games

The Valve Anti-Cheat system is enabled for servers displaying the Secured shield logo. Using custom skins, sounds or maps and playing multi-player mods which do not modify core .EXE and .DLL files will not result in a VAC ban

Cheating in a Source Engine game that was released prior to Left 4 Dead will result in a VAC ban from Counter-Strike: Source, Half-Life 2: Deathmatch, Day of Defeat: Source, and Team Fortress 2.

Cheating in a Gold Source engine game will result in a VAC ban from Counter-Strike, Condition Zero, Ricochet, Day of Defeat, Team Fortress Classic, Half-Life: Deathmatch, and Deathmatch Classic
Call of Duty: Modern Warfare 2