Cal. Lab. Code § 3710.1
Where an employer has failed to secure the payment of compensation as required by Section 3700, the director shall issue and serve on such employer a stop order prohibiting the use of employee labor by such employer until the employer's compliance with the provisions of Section 3700. Such stop order shall become effective immediately upon service. Any employee so affected by such work stoppage shall be paid by the employer for such time lost, not exceeding 10 days, pending compliance by the employer. Such employer may protest the stop order by making and filing with the director a written request for a hearing within 20 days after service of such stop order. Such hearing shall be held within 5 days from the date of filing such request. The director shall notify the employer of the time and place of the hearing by mail. At the conclusion of the hearing the stop order shall be immediately affirmed or dismissed, and within 24 hours thereafter the director shall issue and serve on all parties to the hearing by registered or certified mail a written notice of findings and findings. A writ of mandate may be taken from the findings to the appropriate superior court. Such writ must be taken within 45 days after the mailing of the notice of findings and findings.
Ca. Lab. Code § 3710.1