Justice Denis Clifford has reserved his decision on the legality of a police search on journalist Nicky Hager's home in October last year.
Hager's lawyer, Julian Miles QC, concluded his submissions this afternoon on the third and final day at the High Court in Wellington, arguing for a judicial review over the "raid" of the investigative journalist's Wellington home.
Mr Miles said the raid was a "systematic breach of [journalistic] privilege", and it was a fundamental rule that search warrants on journalists should only be executed in "exceptional circumstances" because of the potentially "chilling effect" on would-be sources or whistleblowers.
He argued police had failed in their "duty of candour" when applying for a search warrant by not disclosing key matters "essential to an application against an investigative journalist".
Police failed to make the case that they could find any evidence to justify the 10-hour long search when applying for the warrant, Mr Miles said.
Earlier, the Crown lawyer representing the New Zealand Police claimed the search was "reasonable, courteous and lawful".
Crown lawyer Brendan Horsley told the court it was not "a raid" or "turning upside down" of Hager's house and was carried out in a "polite and friendly way", in the presence of Hager's lawyers.
The search was executed last October following a complaints from blogger Cameron Slater who claimed he had been illegally hacked.
The emails were disclosed to Hager by the hacker known as Rawshark and formed the basis of his controversial book Dirty Politics.
Justice Denis Clifford reserved his decision until "reasonably practicable".