Activision introduced a new anti-cheat technology for Call of Duty: Modern Warfare III called Server Culling, aiming to reduce the opportunity for wallhack cheats to obtain enemy positions from game data. According to Activision's plan, this technology will cover all maps at the game's launch.
Multiplayer games typically send location data of other participants to players' devices to keep matches running. Wallhack cheats can exploit this data, allowing users to see opponents through walls. Activision states that Server Culling reduces the effectiveness of such cheats by embedding line-of-sight judgment systems into each map, hiding the positions of enemies not currently visible to the player.
Server Culling will work in conjunction with the existing RICOCHET anti-cheat system. This technology focuses on the location data that clients can receive, rather than just processing accounts after cheaters are identified. Activision has recently taken other anti-cheat actions targeting cheat tool developers, among others. There is currently no data on the real-world effectiveness of this technology since its launch.
Activision stated that Server Culling will also be available for DMZ and Combat Outpost at launch, with plans to expand it to all game modes via the first season update.