Cal. Lab. Code § 1302
The attendance supervisor, who is a full-time attendance supervisor performing no other duties, of any county, city and county, or school district in which any place of employment is situated, or the probation officer of the county, may at any time, enter the place of employment for the purpose of examining permits to work or to employ of all minors employed in the place of employment, or for the purpose of investigating violations of this chapter or of Chapter 2 (commencing with Section 48200), 3 (commencing with Section 48400), or 7 (commencing with Section 49100) of Part 27 of the Education Code. If an attendance supervisor or probation officer is denied entrance to the place of employment, or if any violations of laws relating to the employment of minors are found to exist, the attendance supervisor or probation officer shall report the denial of entrance or the violation to the Labor Commissioner. The report shall be made within 48 hours and shall be in writing, setting forth the fact that he or she has good cause to believe that these laws are being violated in the place of employment, and describing the nature of the violation.
Ca. Lab. Code § 1302