I noticed it when I was in Brooklyn two months ago. In DC, where speed and stop cameras are the only form of traffic enforcement and where the bus cameras are also being piloted, the proportion of cars with fake (temp Maryland tags printed on a library printer) or obscured plates is probably approaching 10% of vehicles on the road, and 90% of routine reckless drivers. If NYPD demonstrates a studied indifference to public safety, DC MPD is doing a post-doc in the field.