The systems of oversight across Canada are provincially and territorially regulated and will vary from province to province and jurisdiction to jurisdiction. There are many groups that have a retrospective chart review and audit, like the Ontario system. There are systems where I'm from in Nova Scotia that have both prospective and retrospective reviews of cases in an arbitrary sort of way.
It's difficult to speak to the totality of the Canadian experience. I think each province and territory is obligated to ensure that regulatory standards are upheld to the level that they can be. That's very important.