This should be handled by the CC industry. US pumps should have chips like they do in most every other developed nation. It's an arms race, but prevention is easier than investigation.
And do not blame "the attendants". I worked as a light mechanic at one of the last truly full service stations. The pump/retail guys are payed minimum wage on flexible shifts to do a job that is actually rather dangerous. Only one of possibly a hundred attendants may know anything about the skimmer install. The guys who own/run the stations should also not be above suspicion. My bosses were some rather shady characters.