Have you got any evidence of that, other than your own imagination?
In fact, there's a vast body of literature and disputes with EPA and environmentalists over the matter of using "brown mud" ~ all easily found.
My thoughts regarding "regulations" arise out of my many decades writing them. There are some transferable skills in this world ~ one such skill is the ability to read into a quite reasonable situation the possibility that there's someone in there tricking rules to trip the unwary. Some regulation writing types do it just to make people jump ~ for many good examples of that read through Obamakkkare!