And what I got from other commenters is that their countries hate pieces of gum and shrivelled blackened oranges. It’s not unique to Australia although as an island nation especially prone to biosecurity threats we do have a reputation for taking it more seriously. It’s not a difficult thing to get caught with if you’re paying any sort of attention. You can make mistakes and accidentally (or even purposefully) bring stuff in as long as you own up to it. There’s signage everywhere explaining in words and pictures what is and is not allowed. The custom agents ask you. There’s literally every chance to declare.

It’s not as harsh as it sounds, it’s only when you get caught that it becomes a big deal. It’s like if you got pulled up by the cops. If you try and lie or simply don’t even recognise that you were speeding you’ll probably get a ticket. The analogy breaks down in the “admit fault” side of things because the cop can ticket you anyway, where under our biosecurity law you cannot be punished for declaring goods that would not be allowed in.