Awesome, so let's put the Aussie proposal up against our own constitution and surely we're home free.
What? Oh, right - our constitution has no provision for privacy or for protecting the people from invasive searches, and indeed nothing at all to limit police powers in any way.
Just as well, I suppose; such laws would only hamper the valiant efforts of our enforcement agencies to prevent terrorist attacks and save children from pedophiles.
Or something.