Hamilton police have launched a review of a Rotorua woman's arrest following complaints to Independent Police Conduct Authority.
The Independent Police Conduct Authority has told Hamilton police about a complaint against them.
Complaints about the alleged assault are also being circulated on social networking websites, including Facebook.
Hamilton police area commander Inspector Greg Nicholls said a review into the woman's arrest was underway.
He said the 37-year-old Rotorua woman was arrested in relation to a breach of the liquor ban about 3.45am on Sunday March 17.
"The woman was dealt with by way of a pre-charge warning, a common preventative measure that allows people to be processed without clogging the court system or leaving them with a criminal conviction.
"The process involved once a complaint has been received is that police will submit their review of the incident for the IPCA'S consideration and categorisation alongside the complaint. From there, in line with their independence, the IPCA will determine what, if any further action or investigation is required."
Mr Nicholls said while the process could be time consuming it ensured the integrity of the investigation process.
"All the steps of the process are closely scrutinised by the IPCA in their role as an independent investigative authority.
"The independent nature of the IPCA ensures police actions are scrutinised in such a way to ensure an auditable trail and offers assurances not only for the public but Police staff as well that the process is a fair and robust one."