I know somebody who works for an insect management company in mid-central Ohio who has been instructed to call beekeepers to collect swarms and to never, ever exterminate them. Not sure if there is a formal law but he has never called me to collect a swarm but I am still hoping that this will happen sooner or later.
BTW, on the legal front, I heard that a new law has been introduced in West Virginia where beekeepers are exempt from lawsuits due to stings to humans, animals, and pets.
While at it, something else to consider?