California Code, Code of Civil Procedure - CCP § 2011

If such affidavit be made in an action or special proceeding pending in a Court, it may be filed with the Court or a Clerk thereof. If not so made, it may be filed with the Clerk of the county where the newspaper is printed. In either case the original affidavit, or a copy thereof, certified by the Judge of the Court or Clerk having it in custody, is prima facie evidence of the facts stated therein.