The wording in the article is a little hazy, but I think it was trying to say that it's primarily the domain of the Fish and Wildlife Service rather than local

The wording in the article is a little hazy, but I think it was trying to say that it's primarily the domain of the Fish and Wildlife Service rather than local police or other federal law enforcement. Any particular law enforcement agency doesn't necessarily take interest in every kind of criminal offense - only things that fall under their jurisdiction. I think the point was that this is primarily a concern for Fish and Wildlife right now regarding illegal hunting - that means not really relevant as a threat to Homeland Security or local police forces, but could become so later.