1. You're not supposed to be there till 80.
2. I've turned on healthbars and constantly see sub 80's underground, mining nodes/gathering herbs.
There, now you have a 100% proof that a person is botting/hacking.
*Repeat: Report all sub 80's in your Cataclysm zone. Just /who 1-79 in your zone and you'll know who's botting/hacking*