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.