Cal. Labor Code - LAB § 9015. Section 9015.
Except where in conflict with Section 142.3, or other applicable provisions of law, the standards board may exempt from the provisions of this part and its standards uses of carcinogens which it determines have been shown by a preponderance of the evidence to present no substantial threat to employee health and which may include, but need not be limited to, any of the following:
(a)
Use of carcinogens specified in subdivision (a) of Section 9004 in operations involving the destructive distillation of carbonaceous materials, such as occurs in coke ovens.
(b)
Use of asbestos, except where there is a material risk of substantial and repeated exposure of employees to this carcinogen.
Except as provided in Section 18930 of the Health and Safety Code, the standards board shall adopt regulations for the implementation of the provisions of this section.