California Code
ARTICLE 3 - Legislative Rules and Procedures
Section 9924.

9924. Joint committees

No joint committee shall be established except by passage of concurrent resolution, two thirds of the membership of each house concurring. The membership of each joint committee shall be allocated equally between the Senate and the Assembly, and the delegation from each house shall be chosen pursuant to the procedures set forth in Section 9922.

(Added June 5, 1984, by initiative Proposition 24.)