On the question of toxic chemicals or chemicals of mutual concern, as they're sometimes called now, I think we need to take the kind of approach you suggested, a more preventive approach. I think our approach now is mostly to assume that all chemicals in the environment are benign until proven otherwise, rather than having some kind of rigorous review to ensure that nothing of a seriously damaging nature gets into our waters.
On March 27th, 2014. See this statement in context.