All occupational safety and health standards and orders, rules, regulations, findings, and decisions of the division made and entered pursuant to this part are admissible as evidence in any prosecution for the violation of any provision of this part, and shall, in every such prosecution, be presumed to be reasonable and lawful and to fix a reasonable and proper standard and requirement of safety unless, prior to the institution of the prosecution for such violation, proceedings for a hearing on a special order are instituted, or a petition is filed under Section 11426 of the Government Code.
Source:
Section 6315.5, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=LAB§ionNum=6315.5..