Australian citizens are generally not put into detention facilities. Early in the movie Spit's passport is checked at the airport customs checkpoint and the Custom Officer is alerted by her computer to a discrepancy. The Customs Officer acts on this alert by having Spit followed into the baggage collection area and then detained.
Later it is revealed that Spit arrived on a false passport (which was the passport of a dead Australian man). In practice, the Customs Officer would have asked Spit to attend an interview room and criminal charges may have been laid for using the false passport.
Later it is revealed that Spit arrived on a false passport (which was the passport of a dead Australian man). In practice, the Customs Officer would have asked Spit to attend an interview room and criminal charges may have been laid for using the false passport.