Cal. Penal Code sec. 530.6 provides that you can petition the court for a certification of "identity theft." The link below is to the California Judicial Council forms. Review the Criminal Forms, CR-150 and CR-151. You will also need to work with the police or sheriff and/or your local district attorney to file the petition and get a court to issue the certificate. You can then use a certified copy of this certification to present to the authorities in the other ticket cases to show that you were not the driver.