Cal. Health and Safety Code § 121055

Any defendant charged in any criminal complaint filed with a magistrate or court with any violation of Section 261, 261.5, 262, 266b, 266c, 286, 287, or 288 of, or former Section 288a of, the Penal Code, and any minor with respect to whom a petition has been filed in a juvenile court alleging violation of any of the foregoing laws, shall be subject to an order of a court having jurisdiction of the complaint or petition requiring testing as provided in this chapter. If an alleged victim listed in the complaint or petition makes a written request for testing under this section, the prosecuting attorney, or the alleged victim may petition the court for an order authorized under this section. The court shall promptly conduct a hearing upon any such petition. If the court finds that probable cause exists to believe that a possible transfer of blood, saliva, semen, or other bodily fluid took place between the defendant or minor and the alleged victim in an act specified in this section, the court shall order that the defendant or minor provide two specimens of blood for testing as provided in this chapter. Copies of the test results shall be sent to the defendant or minor, each requesting victim and, if the defendant or minor is incarcerated or detained, to the officer in charge and the chief medical officer of the facility where the person is incarcerated or detained.