Act leader Don Brash is calling for the decriminalisation of cannabis.
He says prohibition of the drug hasn't worked, and policing it costs millions of tax payer dollars and clogs up the court system.
He's told TVNZ's Q&A programme there are other ways to restrict the use of marijuana.
"It's estimated thousands of New Zealanders use cannabis on a fairly regular basis, 6,000 are prosecuted every year, a $100million of tax payers money is spent to police this law," says My Brash.
