Cheats beware, Treyarch has recently posted a security notice on the Call of Duty Community Forum that outlines behaviour that could lead to temporary or permanent bans for offending players.
As far as the Black Ops 2 studio are concerned, punishable behaviour includes modding/hacking, pirated content, unsupported peripherals/applications, boosting, glitching as well as the usual outlawed offensive behaviour. Check out the full list of Call of Duty dos and don'ts here.