How to get the server to auto kick for people who manage to change sv_cheats

the title says it all. a person said cvars.AddChangeCallback i have no idea what that is and another person posted a link http://bananatree.im/wiki/wiki.garrysmod.com/indexc741.html?title=Cvars.AddChangeCallback
can anyone help me how to set up or prevent hackers accessing sv_cheats?