It is all over the place, just have to keep searching for it. It all starts to rhyme. Here is some random link probably only part of the truth, it seams to have some good research in it. https://sgp.fas.org/crs/misc/R42338.pdf There are plenty of laws to get their attention, but I understand that you have to make it political for them or get above their jurisdiction to make it where they can't just ignore it or pay their way out of it.