In solitary confinement now at his Victoria prison - GP isn't allowed to say mass there.
Partly because the only religious books allowed are the Bible - and the Koran.
Also, wine is required for mass - and that is prohibited by the prison authorities, as are all alcoholic beverages.
Some say - that for a prisoner not to be allowed to follow his religion - is an infringement of his human rights.
But there are few precedents for this predicament - as catholic clergy have been relatively rare inhabitants of prisons, so far.
GP has hired an expensive 'celebrity lawyer' for his June appeal; A$25,000 a day, the papers say.
Many of those commenting publicly think his appeal case is not without merit.