Health officials are on alert for "politically sensitive" information being sent to taxpayers, with instructions to run potentially "controversial" details past minister Tony Ryall, according to official documents.
The Ministry of Health process for handling Official Information Act requests has been called "laundering" after different ways of treating requests from the public, media and politicians were revealed.
The Office of the Ombudsman is preparing to investigate the way the public service is dealing with the act, which was designed to increase the public's access to government. It comes after complaints about information releases rose to record levels.
The Herald sought the ministry process showing warnings for officials about releasing "politically sensitive or controversial" details to the public. It has six possible checks for releasing information before it was sent to Mr Ryall's office, where the minister and staff were given five days to review it.