Ah, got it! How would the microchipping requirement be enforced? I know you don't want to add mixes to your topic, but there are so many bully breed crosses that look reasonably pit bull-esque, how could law enforcement tell the difference between a pitt that is supposed to be chipped and a mix that is not required to be chipped? Also, would the microchipping have an accompanying registry, so that if the dog was sold, the new owner would need to re-register it?