...It's not? It's illegal here. It's not often punished just because (a) it's quite rare and (b) most police have better things to do than pulling some guy over

...It's not? It's illegal here. It's not often punished just because (a) it's quite rare and (b) most police have better things to do than pulling some guy over and emissions-testing his car over something that looks like a simple engine problem. It's in the news because it's political, but it's not actually common at all.