Canada definitely enforces those types of laws. Usually with a "we deem you to have not lived there, it's now on you and your costly lawyers or accountants to prove you did, otherwise, fork over the money to us."

It's "free" money, and they need to pay for their healthcare system somehow.

Seriously. I've seen letters from the government asking people to prove they weren't having sex with a housemate. Not only proving a negative, but proving a private and unbroadcasted negative. Because the gov't would make more money if they "deemed" the two were common-law married (which means in a sexual relationship in the same roof for over a year), they said it must be so and left it on the two dorm-mates to prove they WEREN'T fucking.

Canada definitely enforces those types of laws. Usually with a "we deem you to have not lived there, it's now on you and your costly lawyers or accountants to prove you did, otherwise, fork over the money to us."

It's "free" money, and they need to pay for their healthcare system somehow.