California Code, Penal Code - PEN § 30347

(a) An ammunition vendor shall require any agent or employee who handles, sells, delivers, or has under his or her custody or control any ammunition, to obtain and provide to the vendor a certificate of eligibility from the Department of Justice issued pursuant to Section 26710.  On the application for the certificate, the agent or employee shall provide the name and address of the ammunition vendor with whom the person is employed, or the name and California firearms dealer number of the ammunition vendor if applicable.

(b) The department shall notify the ammunition vendor in the event that the agent or employee who has a certificate of eligibility is or becomes prohibited from possessing ammunition under subdivision (a) of Section 30305 or federal law.

(c) An ammunition vendor shall not permit any agent or employee who the vendor knows or reasonably should know is a person described in Chapter 2 (commencing with Section 29800) or Chapter 3 (commencing with Section 29900) of Division 9 of this title or Section 8100 or 8103 of the Welfare and Institutions Code to handle, sell, deliver, or have under his or her custody or control, anyammunition in the course and scope of employment.