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.
Industrial Hygienist Definition and Registration ActProfessional Practice
Section § 20703
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.
industrial hygiene certified industrial hygienist government regulation