California Code, Government Code - GOV § 9925

Each house of the Legislature shall provide in its rules for appropriate voting procedures on the floor and in committees or subcommittees; provided, that no Member shall be allowed to cast a vote for another Member, nor shall any Member be allowed to change his or her vote or add a vote to the roll after the vote is announced, without the consent of four fifths of the membership of the house, nor shall any vote be taken in any committee or subcommittee of either house in the absence of a quorum, except a vote to adjourn.