[myrandomcomment]

Well that is not really true depending on if the state has ever regulated something in the past. For example cars used to come with CA emissions standard as an item because CA regulated air quality before the federal government. It is not in cache right now but I believe they way it came down was if the state has regulated in the past and the state rules are stronger then the federal then the state wins.

[bdhess]

CA got an exemption for CARB written into the federal emissions law at the time it was drafted. That's not the same as being grandfathered in just by virtue of having been the first to regulate.

[myrandomcomment]

Thanks for the clarification. I do believe there was some threat of case law behind this (back to states rights).

Interesting background of the current president trying to pull the waver here:

https://www.theatlantic.com/science/archive/2017/03/trump-ca...