In my experience, games with anti-cheating code allow the server admin to turn it on and off at will. Games using PunkBuster or VAC often have a column in the s

In my experience, games with anti-cheating code allow the server admin to turn it on and off at will. Games using PunkBuster or VAC often have a column in the server browser showing whether cheat prevention is enabled. Of course that's not a solution for games that only support peer-to-peer matches.