Not that this is particularly important to your point, but 30 over vs 5 over is usually a different law. I'd argue that there's a qualitative difference betwee

Not that this is particularly important to your point, but 30 over vs 5 over is usually a different law. I'd argue that there's a qualitative difference between selective enforcement that involves informal standards that evolve over time (e.g. police ignoring anyone who breaks the speed limit by less than 10MPH) and selective enforcement that involves a law that hasn't been enforced for centuries being pulled out of retirement and aimed at a single individual.