Both sides of the cannabis referendum debate have found common ground when it comes to drugged driving. If you've used, do not drive. Full stop.
Some road safety campaigners fear that road deaths could rise if cannabis is legalised, but University of Otago professor Joe Boden says that hasn't happened overseas.
Joe Boden told Ben Strang a roadside drug testing system needs to be in place before cannabis could be legalised.
