A neighbour has a vehicle on which the rear numberplate is being deliberatly obscured by a sticker. It's more than likely that this has been put there by the owner to avoid identification of the vehicle in the eventuality of it speeding or running over a puppy. Should I: a) pull it off b)inform the owner of the vehicle of its presence ( despite the fact that they almost certainly know it's there) c) mind my own business and let our law enforcement agencies deal with it ?