Cal. Lab. Code § 1053

Nothing in this chapter shall prevent an employer or an agent, employee, superintendent or manager thereof from furnishing, upon special request therefor, a truthful statement concerning the reason for the discharge of an employee or why an employee voluntarily left the service of the employer. If such statement furnishes any mark, sign, or other means conveying information different from that expressed by words therein, such fact, or the fact that such statement or other means of furnishing information was given without a special request therefor is prima facie evidence of a violation of sections 1050 to 1053.