The former top cop serving 4 1/2 years behind bars for covering up Louise Nicholas' original rape allegations will go to the Court of Appeal this week in a bid to have his conviction and sentence thrown out.
The basis of John Dewar's appeal, to be heard on Thursday, revolves around what he claims are inconsistencies and contradictions in some of the evidence Nicholas gave at his trial last year, and at the trials of former police officers Clint Rickards, Brad Shipton and Bob Schollum.
The self-employed father of four was chief inspector of the Rotorua CIB when Nicholas approached police in 1993 with historic sex allegations against Rickards, Shipton and Schollum.
Dewar was convicted of suppressing, discouraging and preventing any formal investigation or prosecution.
He was also found guilty of deliberately giving inadmissible evidence at two trials of another policeman facing rape allegations.