If you believe someone is cheating or otherwise violating the rules, contact a creator. See the contacting creators helpfile.
A creator should acknowledge receipt of your complaint, but you may or may not be informed of the outcome of the investigation.
After you have reported your suspicions, you should proceed in your roleplay as if whatever behavior you are witnessing is legitimate. This does not, however, preclude you from killing the offending party.
It is prohibited to post accusations or other discussion of OOC cheating on IC bulletin boards. The person posting the note may be punished.
rules - accusations 12/01 by Raven