“Dow said he would contact the New York man to inquire if the bag fell from his vehicle without his knowledge or if he deposited the bag in the driveway on purpose.”
I can see this kind of response had the trash bag been the first incident. Given that it has repeatedly happened, I think that’s a pretty milquetoast response. I would just issue him a summons or fine him whatever is appropriate for littering. If he has a defense, he can present it himself. As it is, the man will just assert the latter excuse and will get away with it.
Whoops, meant the first excuse, not the latter one.