The Supreme Court of Canada has ruled that local communities, at the municipal government level, can issue bans on substances that, while never shown shown to be harmful, theoretically still might be (If you want, we can also debate the notion of trying to prove a negative, but that’s probably better left to another thread).
Specifically, Health Canada has found various pesticides safe. No evidence was mustered to demonstrate to that Agency that any of 7000 or so pesticides available in Canada poses any danger. Notwithstanding this “seal of approval” from Health Canada, a small community in Quebec enacted legislation to ban their use. The Supreme Court found in the community’s favour when the law was challenged. In effect, this ruling has extended the power of municipal governments to the point that they can overrule federal or provincial authorities.
The issue is neatly and succintly summarized in this editorial. I could not make the case any better than the editorial writer.
Bottom line is that the Supreme Court has now made it legal for the opinions of those in power to be made into law on the grounds that it’s better to be cautious even when there is not an iota of proof of any danger.
Logically then, local communities should now be able to ban the use of any substance, or group of substances. After all, there is always the possibility that the substance(s) could turn out to be dangerous. It would just be a precaution.