Not to say its a bad idea. The thing is that I'm pretty sure the NFA has looked into it some, and they do try to keep bad laws out. They were successful in getting the long-gun registry tanked, due to its needless over-spending. But Canada overall has a different legal culture when it comes to weapons in general, and also in the public sphere there is a different perception. I don't think many people see a switchblade as a tool, because they've never been exposed to automatic rescue knives. That said, any organization that wanted their employees to carry switchblades could probably lobby to make that happen, but I doubt it would be cost effective. It also has to do with a difference in power balance between local, provincial and federal compared to how its broken down in the US, so the comparison isn't 1-1. The legal framework that CBSA is using to make its own declarations have also been abused in the past in other areas, but there is a lot of pressure for them to keep those powers that are far in excess of what would otherwise be allowed because they fit will within the security theater, and can do things other police forces could not. Where that pressure is coming from, be it 5eyes or the US only, I don't know. But most Canadians don't see extrajudicial actions as the problem that Americans would, that whole constitutional powers thing.