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Police are unable to disclose how many arrests were made by officers affected by a ''monumental cock-up''.
Sixty-three officers, who returned to the police force between October 2009 and July 2013 were not properly sworn-in, potentially opening arrests up to legal challenges.
Police Minister Anne Tolley slammed the oversight as a ''monumental cock-up'', and expressed her concern to the Police Commissioner.
Parliament went into urgency on October 24 to pass a retrospective law validating the police oaths of the officers.
At the time, police were unable to provide details of those affected officers, including arrests they had made, and asked that further questions be detailed in an Official Information Act request.
In a reply to the Otago Daily Times, Police National Headquarters human resources general manager Brendan Keys declined to detail the number of arrests made by each officer.
''The information requested cannot be made available without substantial collation or research,'' he said.
''Police does not produce statistics on arrests.''
However, police were able to provide a district breakdown of the 63 officers, but said those figures did not necessarily reflect the district they were in at the time they were sworn in.
Under changes to the Policing Act in 2008, oaths sworn by returning officers had to be administered by the Commissioner of Police, or a person authorised by him, instead of by district commanders or inspectors.
The highest number of police officers affected came from Auckland City and Counties Manukau with 12, followed by Bay of Plenty with 11.
Of the 12 police districts, Southern came in seventh equal with three police officers affected.
A breakdown of those 63 police officers revealed eight were constables, four were sergeants and one was an inspector.