It was obvious police over-reach, and today a jury in Wellington told the police to go fuck themselves, acquitting one defendant, and refusing to convict the other three. A retrial has been ordered on the latter, but the question now is whether the police will actually go ahead with it, or give up rather than run the risk of another jury sending a stronger message.
And this is ultimately why we have juries: so we can tell the state where to get off when they go overboard. Because no matter what the law says, we can always simply say "no".