It could take 10 years to measure the impact of legalising weed – should New Zealand's proposed law be even stronger?
- Written by Chris Wilkins, Associate Professor of illegal drug research, Massey University

The referendum on legalising recreational cannabis use is just over a month away. Campaigns for and against the change are well under way.
We’ve had expert reports from the Helen Clark Foundation, the Office of the Prime Minister’s Chief Science Advisor, the New Zealand Institute of Economic Research and meetings...