Penal Code § 29120
ARTICLE 3. Prohibitions and Requirements Applicable to Licensee
(a) A licensee shall require that each employee obtain a certificate of eligibility pursuant to Section 26710, which shall be renewed annually, before being allowed to come into contact with any firearm.
(b) A licensee shall prohibit any employee who the licensee knows or reasonably should know is prohibited by state or federal law from possessing, receiving, owning, or purchasing a firearm from coming into contact with any firearm.