Over the past several months I've had to deal with more than a few people who are either outright multiplaying or abusing the LAN policy. If you read "HELP RULES" you will see that any multiplaying whatsoever, full stop, is a zap to level 1. There is nothing in there that says "Except when..."
The LAN policy is very clearly written and can be found in the policy forum. The multiplaying prohibition has been in place ever since I can remember. These are not new and surprising policies.
In the past I have tried to be nice about these situations by giving a warning, not zapping all the way to level 1, etc. Since the idea of "give an inch, they take a mile" seems to be what's happening because of it, I'm going back to zero tolerance.