Section § 20703

Explanation
This law says that state or local government agencies can't make rules about how certified industrial hygienists do their job, unless a state law specifically allows them to regulate a certain activity related to industrial hygiene.
No entity of state or local government shall by rule or otherwise regulate the practice of industrial hygiene by any certified industrial hygienist, except where authorized by state statute to regulate a specific activity that may include the practice of industrial hygiene.