[wanderingstan]

Most auto drivers, myself included, regularly (and with impunity) break the law against driving over the speed limit. If police announced they intend to start ticketing people for even 1-9mpg speeding violations, we would all agree this was a massive "policy change."

(Note that I'm not saying that these law breaking activities are equivalent; only that there are a multitude of laws that are not enforced, and a change in enforcement is indeed a policy change.)