California Code, Government Code - GOV § 7285.1

(a) Except as otherwise required by federal law, an employer, or a person acting on behalf of the employer, shall not provide voluntary consent to an immigration enforcement agent to enter any nonpublic areas of a place of labor. This section does not apply if the immigration enforcement agent provides a judicial warrant.

(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 enter a nonpublic area of a place of labor 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 locations affected in a day.

(c) This section shall not preclude an employer or person acting on behalf of an employer from taking the immigration enforcement agent to a nonpublic area, where employees are not present, for the purpose of verifying whether the immigration enforcement agent has a judicial warrant, provided no consent to search nonpublic areas is given in the process.

(d) 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.

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