Cal. Lab. Code § 2666
The Division of Labor Standards Enforcement shall enforce the provisions of this part. The division and the authorized representatives of the Department of Industrial Relations are authorized and directed to make all inspections and investigations necessary for the enforcement of this part. Every employer shall permit authorized employees of the division free access to his place of business for the purpose of making investigations authorized by this part or necessary to carry out its provisions and permit them to inspect and copy his payroll or other records or documents relating to the enforcement of this part, or interview his employees or agents. The division may make, in accordance with the provisions of Chapter 3.5 (commencing with Section 11340) of Part 1 of Division 3 of Title 2 of the Government Code, such rules and regulations as are reasonably necessary to carry out the provisions of this part. The violation of any such rule or regulation shall be deemed a violation of this part.
Every law enforcement officer of the state, any county, municipality, or other government entity who has reason to suspect any violation of this part shall have all the powers of an authorized representative of the Department of Industrial Relations, in the investigation of such suspected violation.
Ca. Lab. Code § 2666