Snowbird wrote:

Is it possible this is some Federal or State health regulation?

Probably State. Many of the northeastern States use health regulations to get
around the Federal control over interstate commerce and establish defacto
trade restrictions. The main target is dairy products, but there are others.
This is less true in the midwest, but it's still there. Lots of States have
regulations deliberately interfering with the "importation" of Wisconsin dairy
products, for example. In fact, the Feds also have one, but this is a nearly
unique example of this sort of thing among Federal regulations.

George Patterson
If you're not part of the solution, you can make a lot of money prolonging
the problem.