In Reply to: Customs In Oz posted by mummatosix on Saturday, 7. September 2013 at 19:06 Bali Time:
....what history of you they have on their database.
Also baggage is x rayed as it comes off the flight so if they see something a bit sus they can insure that you go for further attention before exit from Customs control.
They are also very good at assessing peoples demeanour which can also flag you for further attention.