Well, first, we're talking about Canada.
Second, and this is critical, they can pass any laws they want, but that doesn't mean they're legal. The fact is that warrantless wiretapping in Canada is unlawful NO MATTER WHAT NEW LAWS THEY PASS. The Supreme Court of Canada has struck down laws that aren't acceptable, and one notable ruling was a mandatory sentence which was ignored the same day the law was assented. The ink was literally still wet on the Governor General's signature. (I mean "literally" in the English Composition sense, not the Interweb vernacular)
We have a Constitution, and ours is from 1982, so we can actually ask the asshole who got it signed. Highlights are that it says right in there that it's the highest law in the land, end of story. In there, you have the right to privacy. Frankly, anybody who gets convicted on something found by a warrantless wiretap will end up walking because it's just not lawful.
Finally, our governments in the US and Canada think that anything that's not in the Constitution is free game, and that's totally wrong. The Constitution is the only document that allows the government to exist at all. If they don't follow the only laws that let them make choices for us, it's time to kill them all -- every last one of them -- and leave their corpses hanging from the legislature as a warning to others.
Don't burn down the building and salt the land though, it's a heritage building and can't be replaced.