Cal. GOV § 7285.2

(a) (1) Except as otherwise required by federal law, and except as provided in paragraph (2), an employer, or a person acting on behalf of the employer, shall not provide voluntary consent to an immigration enforcement agent to access, review, or obtain the employer’s employee records without a subpoena or judicial warrant. This section does not prohibit an employer, or person acting on behalf of an employer, from challenging the validity of a subpoena or judicial warrant in a federal district court.

(2) This subdivision shall not apply to I-9 Employment Eligibility Verification forms and other documents for which a Notice of Inspection has been provided to the employer.

(b) An employer who violates subdivision (a) shall be subject to a civil penalty of two thousand dollars ($2,000) up to five thousand dollars ($5,000) for a first violation and five thousand dollars ($5,000) up to ten thousand dollars ($10,000) for each subsequent violation. If a court finds that an immigration enforcement agent was permitted to access, review, or obtain the employer’s employee records without the consent of the employer or other person in control of the place of labor, the civil penalty shall not apply. “Violation” means each incident when it is found that subdivision (a) was violated without reference to the number of employees, the number of immigration enforcement agents involved in the incident, or the number of employee records accessed, reviewed, or obtained.

(c) The exclusive authority to enforce this section is granted to the Labor Commissioner or the Attorney General and enforcement shall be through civil action. Any penalty recovered shall be deposited in the Labor Enforcement and Compliance Fund.

(d) This section applies to public and private employers.