Police have defended their investigation into the unlawful break-up of Wellington party, saying "there was no cover-up".
Responding to a damning Independent Police Conduct Authority report, Assistant Commissioner Grant Nicholls said while police had misinterpreted the law they had acted in "good faith".
He also refused to confirm whether police would apologise to Jakob Christie, whose neck was broken while police broke up the Khandallah party in September 2009.
"The issue of an apology is something that we are going to explore with Mr Christie," he said.
"It is something we need to do in a private context."
Despite breaking the law by entering the house, Mr Nicholls said none of the 11 officers involved had been, or would be, disciplined.
"Our belief is the police acted in good faith in terms of entering the property."
He said a previous police investigation, which took three years and largely cleared the officers of wrongdoing, had been poorly resourced but rejected the report's suggestion that it was not conducted in a "unbiased" way.
"There is no cover up."
Earlier this morning the Independent Police Conduct Authority slammed police over its handling of a rowdy Wellington party, saying it used "unnecessary, excessive force".
Mr Christie, then 19, said a police officer struck him in the neck with a baton as he left the party, while two other partygoers said they saw a policeman beat him around the neck.
Flanked at a press conference by his lawyer Keith Jefferies and PR man Iain Morrison, whose son was also at the party, Mr Christie said he was still waiting for an apology from police.
"I haven't actually had an apology from the police or heard they've accepted the IPCA report, I think not only I but everyone who attended the party is due an apology."
Mr Christie said he still suffered health issues from the injury and had changed from an outgoing person to someone who was withdrawn and did not like to go out.
He was currently unemployed and had struggled to find work as most employers "did a Google search" to check out a potential employee and were turned off by stories that appeared.
Police had refused to provide photos of the officers who attended the party so Mr Christie could try and identify who had struck him.
Mr Morrison said it was incredible the officer had not been identified and described actions on the night of the party as "police thuggery".
"It's ironic we're not allowed to smack our children but these police officers can baton our kids."
A police internal review - released in December last year, more than three years after the incident - found no fault on the part of the officers.
Eleven complaints were made to police after several young people also said they were struck with batons when the squad of 20 police officers closed down the party.
The review dismissed police culpability in each case, either because of insufficient evidence or because the force used was deemed ''reasonable''.
But this morning the authority released its own investigation into the incident and found differently.
Authority chair Judge Sir David Carruthers said the police's failure to conduct a robust, thorough and timely investigation was "unjustified, unreasonable and unfair".
"Not only have the complainants waited over three years for an outcome, the officers involved have also had this matter outstanding for the same amount of time ... such a delay is inexcusable."
Police had acted unlawfully in entering the property without permission and public order policing needed to be looked at urgently as a result, he said.
Although some of the force used was reasonable as it was used in self-defence, other force was used to unlawfully remove partygoers from the house and therefore unjustified.
It also found the baton strike on Mr Christie that broke his neck was "excessive and contrary to law". However, the authority was unable to determine which officer was responsible.
The authority had also investigated a complaint that unauthorised material was sent to a media outlet following the incident.
The release had been made to discredit a complainant but the administrator who leaked the information had left the police, he said.
In a statement, police said they accepted many of the IPCA's findings, including the "possibility" that Christie's broken neck could have been caused by a police baton.
Police said it was "regrettable" that the investigation had taken four years and that one of its staff had leaked a report to media in an attempt to discredit Christie.
"Police have apologised ... for breaching his privacy and acknowledge the distress this action caused."
Work was already under way on the national police policy on dealing with disorder, which was urgently recommended by the authority.
Police attended more than 6500 noise complaints a year and most are dealt with professionally, the statement said.
- © Fairfax NZ News
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