Mr. Cannings, I think the challenge is to get into the hearts and minds of the community, to convince the people that if they choose to use cannabis they should separate this behaviour from driving.
I suppose we have the luxury of not having to prove impairment at all. If we detect cannabis or illicit drugs in the system, the courts can uphold drug driving. The challenge for you is whether it's a public awareness campaign, an enforcement campaign, or both. We do both in Australia. We certainly have proactive advertising around separating behaviours.
I think there needs to be some sort of stick around enforcement. People should fear that if they run the gauntlet of having illicit drugs in their system, then they may get detected and charged. I think there are challenges if you don't have a general deterrence model in your law enforcement activity. People will think they'll be able to run the gauntlet and they'll be putting other road users at risk.