Just because the "authorities" said it was prohibited material, doesn't mean it's so, unless he has admitted/acknowledged that the material is illegal. Let the Captain have his day in court.
Maybe some locals could let the forum know what search rights the Australian authorities have and what our rights are against illegal search and seizure. What about probable cause? Did the authoritites ask permission from the Capt to search his computer and did he grant permission?
My brother, who is a cop (albiet not in Autralia), tells me that whenever any law enforcement asks to search, you should ALWAYS say no. Put the accountability for probable cause squarely on the shoulders of the fuzz regardless how innocent you think you are.
PQ