This whole thread is getting far afield of IDs. However on the topic of insiders attacks. Internal security is a nessary to maintian a safe system. There are howerver, a few simple rules that i have incountered that will help you along in this field.
Network security is a key to a secure working enviroment.
Do not leave simple things uncovered. Novell is a batchfile OS so secure it, do not allow users to execute it's sudo-dos commands. If you got a dumb person answering fones with a account on your system and they call in your introuble. I got some others if anyone cares to continue this theme.