Nothing in this division shall be construed to limit the jurisdiction of the state over any employmment or place of employment by reason of the exercise of occupational safety and health jurisdiction by any federal agency if federal jurisdiction is being exercised under a federal law which expressly authorizes concurrent state jurisdiction over occupational safety or health issues.
Source:
Section 6303.5, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=LAB§ionNum=6303.5..