Cal. Gov. Code § 11188
Upon the filing of the petition the court shall enter an order directing the person to appear before the court at a specified time and place and then and there show cause why the person has not attended, testified, answered interrogatories, or produced or permitted the inspection or copying of the papers or other items described in subdivision (e) of Section 11181 as required. A copy of the order shall be served upon the person in the manner provided for the service of a summons described in Chapter 4 (commencing with Section 413.10) of Title 5 of Part 2 of the Code of Civil Procedure. If it appears to the court that the subpoena was regularly issued, or the interrogatories were regularly promulgated, by the head of the department, the court shall enter an order that the person appear before the officer named in the subpoena at the time and place fixed in the order and testify or produce and permit the inspection and copying of the required papers or other items described in subdivision (e) of Section 11181 as required or answer the interrogatories without objection. At the request of the department head, the court may issue any additional order to aid the implementation of the order enforcing compliance with the subpoena, including the issuance of a commission or letters rogatory in the manner provided for the enforcement of a deposition notice to a nonparty as described in Section 2026.010 or 2027.010 of the Code of Civil Procedure. Upon failure to obey the order, the person shall be dealt with as for contempt of court.
Ca. Gov. Code § 11188