California Code, Penal Code - PEN § 629.66

Applications made and orders granted pursuant to this chapter shall be sealed by the judge.  Custody of the applications and orders shall be where the judge orders.  The applications and orders shall be disclosed only upon a showing of good cause before a judge or for compliance with the provisions of subdivisions (b) and (c) of Section 629.70 and shall not be destroyed except on order of the issuing or denying judge, and in any event shall be kept for 10 years.