That's the thing, you don't have to enforce any law 100%. You start enforcing it for the most egregious cases and others get a little more hesitant to break th

That's the thing, you don't have to enforce any law 100%. You start enforcing it for the most egregious cases and others get a little more hesitant to break the law. Then you do it again and more back off. At some point, you reach a happy medium where there's "enough" enforcement that egregious cases are rare and punished heavily while the rest aren't worth punishing. Yes, just like speeding.