How hard is it to right a wrong in this country?
If the case of Teina Pora is any example, the answer is "too bloody hard".
Mr Pora is now a free man after the Privy Council this week quashed his convictions for the 1992 rape and murder of Susan Burdett.
Mr Pora spent more than two decades in prison, despite evidence arising in 1996 linking Malcolm Rewa to the murder scene, and Rewa's subsequent conviction for the rape of Ms Burdett.
Even though Mr Pora's initial convictions were quashed by the Court of Appeal in 1999, he was convicted again at retrial in 2000, based in part on his confessions, confessions that Mr Pora's legal team have now successfully argued could not be regarded as reliable.