Cal. HSC § 113977

(a) Except as specified in subdivision (b), an employee shall eat, drink, or use any form of tobacco only in designated areas where contamination of nonprepackaged food; clean equipment, utensils, and linens; unwrapped single-use articles; or other items needing protection cannot result. (b) A food employee may drink from a closed beverage container if the container is handled to prevent contamination of the employee’s hands, the container, nonprepackaged food, and food-contact surfaces.