Yes. I'd love to see the same rate of training and effort rolled out in Canada as was done in the United States in regard to detection and enforcement with regard to impaired driving. That's ultimately also the explanation.
In the United States, it's well known that driving under the influence is severely enforced on any number of fronts and that the penalties are very severe. As a result, I would humbly submit that there are strong endogenous constraints here because there was already a strong culture of enforcement against DUIs, in a way, where in Canada we tend to show greater latitude.