Agree with Mr Buzzy.
However, you could ring them. Even rent-a-cops have a phone and each airport seems to have their own policy with this sort of thing. The bigger airports seem to have multiple policies for the same damned building
. They shouldn't but they do.
Ring the airport authority and work from there. Aim to talk to the screening manager (or similar title) for the terminal you're travelling through (Qantas, Virgin or generic) who will work for the same contract company the rent-a-cops do. Don't get fobbed off by anyone who works for the airport because they probably won't have a clue. You want to speak to the guy (or gal) who directly tells the rent-a-cops what to do.