A police constable has been charged with assault after allegedly using excessive force at the Cromwell police station.
Police this evening announced they had completed an investigation into the alleged incident.
Inspector Olaf Jensen said the constable had been charged with assault and would appear in Alexandra District Court next week.
The incident was also being investigated by the Independent Police Conduct Authority.
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"As this matter is before the court, police have no further comment to make at this time," Mr Jensen said.