California Code, Code of Civil Procedure - CCP § 2025.610

(a) Once any party has taken the deposition of any natural person, including that of a party to the action, neither the party who gave, nor any other party who has been served with a deposition notice pursuant to Section 2025.240 may take a subsequent deposition of that deponent.

(b) Notwithstanding subdivision (a), for good cause shown, the court may grant leave to take a subsequent deposition, and the parties, with the consent of any deponent who is not a party, may stipulate that a subsequent deposition be taken.

(c) This section does not preclude taking one subsequent deposition of a natural person who has previously been examined under either or both of the following circumstances:

(d) This section does not authorize the taking of more than one subsequent deposition for the limited purpose of Section 485.230.