Exonerated former murder defendant Alan Hall (foreground) and brother Geoff Hall speak with the media outside the High Court at Auckland following the acquittal of two police officers involved in the 1985 murder investigation. Photo / Craig KapitanExonerated former murder defendant Alan Hall (foreground) and brother Geoff Hall speak with the media outside the High Court at Auckland following the acquittal of two police officers involved in the 1985 murder investigation. Photo / Craig Kapitan

Two elderly former police officers are on trial in the High Court at Auckland accused of perverting the course of justice during the 1986 murder trial of Alan Hall. Photo / Dean PurcellTwo elderly former police officers are on trial in the High Court at Auckland accused of perverting the course of justice during the 1986 murder trial of Alan Hall. Photo / Dean Purcell

Justice Ian Gault. Photo / Dean PurcellJustice Ian Gault. Photo / Dean Purcell