The High Court has been told Australian officials did not do anything illegal during the deportation of former Solomon Islands attorney-general Julian Moti to Australia.Moti faces sex abuse charges related to alleged offenses in Vanuatu and New Caledonia in 1997.
Early attempts by the Australian Federal Police to extradite Moti failed, but in 2007 he was deported from the Solomon Islands and immediately arrested when he arrived in Australia.
He has so far avoided a trial as he fights his deportation in the courts.
His lawyers have told the High Court Australian and Solomon Island officials colluded in what they described as a sham extradition.
They say the fact Australia released travel documents is one example of cooperation.
But lawyers for the Commonwealth say there is no evidence of collusion.
The prosecution says the Solomon Islands government was determined to remove Moti and Australia had no other option but to issue the documents.
The case has been reserved.