[purepulp]

For discussion sake, when you rent out your apartment, I think it is reasonable to assume that your tenants are using it for residential purposes. You can't possibly ask them if they will be turning it into a brothel. And even if you do ask, I don't think anyone will say "Yes, it will become a brothel, do come and visit when you have time."

So I'm not sure how they will be able to prove that you knowingly and intentionally rent your house out for illegal purposes, not just vice but it could be for drugs, gambling etc.

Do they expect landlords to conduct spot-checks?