(a) sufficient political donations/bribes to get lawmakers to draft suitable language themselves (or via their staff)

(b) a combination of political donations and a worldview on the part of lawmakers in which it is "just normal" for those affected by regulations to draft them, such that you yourself are able to draft the legislation.

There are levels of government where neither of these require incredible levels of wealth, I suspect.

Both could be stopped by limiting political donations and a political culture in which "the chemical industry writes its own rules" is self-evidently corrupt and/or non-sensical.