Probably a lot more common practice than many would think. Cops are convinced their job is to ‘catch criminals’, to the extent that they treat everyone as a potential lawbreaker. It’s clear in the way they generally interact with the public, treating each person as a threat to their life.

We absolutely cannot trust the police not to do this, even when it is explicitly illegal. However, we can and should make it explicitly illegal because there should be a strong message sent.