A law expert says claims by Police that officers did not know they were breaking the law when they used roadblocks to get information on gang members, doesn't stack up.
Last week the Independent Police Conduct Authority found officers illegally detained a woman and photographed her and her partner at a checkpoint in Northland in 2019.
Northland District Commander Tony Hill told RNZ reporter Jordan Bond that while the tactic has been used for year, officers didn't know they weren't following the law.
But University of Otago Law Professor, Andrew Geddis, says police were told a year before the Northland operation that they could not use Land Transport laws as a ruse to gather intelligence.
Professor Geddis spoke to Corin Dann.