Nonsense. Man power? come on...there are a small amount of shops selling this stuff in hand full of states, they could shut this down if they wanted...How many have they busted so far? Zero that I have heard of. Besides if they just took out a few, then fewer would be eager to get to market.
It is not the feds job to selectively pursue a case because they don't think they can get a conviction...their job is to enforce the law.
Besides many terrorist cells probably have some drug connections so you get a twofer
when you make a bust.