CA Civ Proc Code Section 2020.420

The officer for a deposition seeking discovery only of business records for copying under this article shall be a professional photocopier registered under Chapter 20 (commencing with Section 22450) of Division 8 of the Business and Professions Code, or a person exempted from the registration requirements of that chapter under Section 22451 of the Business and Professions Code. This deposition officer shall not be financially interested in the action, or a relative or employee of any attorney of the parties. Any objection to the qualifications of the deposition officer is waived unless made before the date of production or as soon thereafter as the ground for that objection becomes known or could be discovered by reasonable diligence.