Five people have been arrested in a meth bust on the North Shore - and police have found details of "hundreds" of their clients.
Waitemata Police carried out search warrants on Thursday and Friday, resulting in the arrest of one woman and four men.
Detective Inspector Hayden Mander said methamphetamine, GBL, large amounts of cash and drug paraphernalia were also seized.
"We are confident this group involved in the supply of methamphetamine has been stopped," he said.
"Police have managed to not only block their supply, but also identified hundreds of their clients who we will be following up with to provide prevention advice and local support services."
Mander said the five were charged with a range of charges relating to supply and possession of methamphetamine.