California Code, Government Code - GOV § 9923

No special or select committees nor any subcommittee shall be established in either the Senate or the Assembly except by affirmative vote of two thirds of the Committee on Rules of the house in question. Membership of special or select committees or subcommittees shall be determined according to the provisions of Section 9922. For purposes of this title, “special” and “select” committees or subcommittees include all committees or subcommittees which are not standing committees of either house or joint committees of the two houses.