The owner of a commercial or industrial building or structure, employer, or contractor who engages in, or contracts for, asbestos-related work shall make a good faith effort to determine if asbestos is present before the work is begun. The contractor or employer shall first inquire of the owner if asbestos is present in any building or structure built prior to 1978.
Source:
Section 6501.9, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=LAB§ionNum=6501.9..