God knows.
When we were "officially" farming we got all these letters about how we should keep our chickens locked up inside because of ViRuSeS. We ignored all of that stuff. 
They have no way to enforce all these things, except for the mega farms where they literally have their own personnel for "compliance" (no joke). 

Our customers bought with us **because** of the whole pasture rotation + bug eating set up. We delivered.