Now this is a thorny issue.
AdHoc Rogues are hosts (like laptops, PDA's, printers) with their wireless turned on and attempting to connect to each other (without the use of an AP).
This is a thorny issue because it's hard to regulate users using a "free" spectrum.
In my network, I'd "contain" Rogues when I have verified that they are found WITHIN our building or premises. This is also the main reason why I'd recommend to disable auto-containment of Rogues (default) as you can detect Rogues from your WLC's even if the users are found OUTSIDE your building/premises.
If you plan to contain Rogues, make sure you have an approved written policy regarding the Rogues otherwise you might get yourself into trouble.
Hope this helps.