Canada's rules with respect to oil tankers are largely set by the International Maritime Organization. They're set out in the international convention from which we draw the definition of crude oil. It's called “MARPOL” in its short form. These rules are negotiated at the IMO, and Canada implements them through its own law. That would be consistent, really, with the rest of the world.
On October 19th, 2017. See this statement in context.