California Code, Code of Civil Procedure - CCP § 2025.540

(a) The deposition officer shall certify on the transcript of the deposition, or in a writing accompanying an audio or video record of deposition testimony, as described in Section 2025.530, that the deponent was duly sworn and that the transcript or recording is a true record of the testimony given.

(b) When prepared as a rough draft transcript, the transcript of the deposition may not be certified and may not be used, cited, or transcribed as the certified transcript of the deposition proceedings. The rough draft transcript may not be cited or used in any way or at any time to rebut or contradict the certified transcript of deposition proceedings as provided by the deposition officer.