Can get defected in another state, but once you are back in victoria you can take it off and not worry about it. Had a mate get a defect in SA. Just came back and ripped it off and never heard about it again.
Worse thing that could happen i guess if the cop wants to be a wanker is deem your car as too unsafe and ground it so you cant drive it then and there. Would be a bit of trouble if you're in another state :|