Police put the public in danger when they repeatedly crashed into a car to stop it during a chase last year.
The Independent Police Conduct Authority investigated the chase, which began after a Honda driver failed to stop at a checkpoint on Auckland's North Shore in the early hours of September 3 last year.
The IPCA found that during the chase along the Southern and Southwestern motorways police "repeatedly failed to comply with aspects of the fleeing driver policy" when they rammed the car with five occupants inside.
The pursuit controller authorised officers to use "reasonable force" to arrest the driver. Two officers then intentionally rammed the Honda with their cars.
The IPCA found that the controller was wrongly told that the Honda had rammed a police car, and was not told that six police cars were following it.