Cal. Civ. Proc. Code § 2015

(a) When an affidavit is taken before a judge or a court in another state or in a foreign country, the genuineness of the signature of the judge, the existence of the court, and the fact that such judge is a member thereof, must be certified by the clerk of the court under the seal thereof.

(b) This section shall not apply to oaths administered for admission to the State Bar of California pursuant to Section 6067 of the Business and Professions Code.