Pretty simple to understand. BP issued the marching orders to their marketing arm, the ?non-profit?'health" organizations. They in turn went to the FDA, raised a stink and got them involved. That started the embargo but after being sued and losing in Fed court, Appeals court and their attempt to get a review by the entire Appeals court, they gave up.
That forced the ?non-profit?"health" associations into a new game plan. Attack from the local and state levels via the unelected health departments. Thus you see what you're seeing in Boston.