"OK, more specifically BST and rBGH."

They're all the same thing. I guess you missed the part in the post of 09 Nov 15 - 01:23 PM where it says that the added BGH is indistinguishable from the native and that measured levels in treated milk fall within the range of variation for untreated milk. That's an important fact right there but one that is conveniently ignored by those espousing a cause but not understanding the science.