A senior policeman is under pressure to explain his decision not to prosecute a school principal.
Inspector Les Paterson of North Shore Police investigated former Kristin School headmaster Peter Clague after the principal's ex-wife, Jeanne Jackman, accused him of assault.
Clague is now subject to a private prosecution on the claim. Earlier, police said the decision not to prosecute was made because Jackman delayed reporting the incident
Now Paterson has been summonsed to appear as a witness in the private prosecution case, and had to provide an affidavit explaining his actions.
A police source said police were reviewing Paterson's decision.