As to the second question, no. I don't think Ontario has focused on this either. People tend not to get this distinction between rental dwellings with these other competing interests and detached homes. As to the first question, the question of damage, yes, Ottawa, for example, has a marijuana grow op remediation bylaw, and there is within it no test.
Any grow op could trigger a report by the police to the city, which then triggers the city to go to the owner and say, “you had marijuana growing in your unit or in your dwelling that you own. Prove to us that there's been no damage.” One would hope the police would not go with six plants or eight plants or 10 plants or 12 plants or whatever. But if the police go with that, then that owner is basically looking at $10,000 of expert reports from engineers, air quality control, and electrical safety to prove there's been no damage to the unit. Plus they're on this registry, which might knock $10,000 or $20,000 off the value of their house.