California Code
CHAPTER 4 - Joint Custody
Section 3082.

3082. When a request for joint custody is granted or denied, the court, upon the request of any party, shall state in its decision the reasons for granting or denying the request. A statement that joint physical custody is, or is not, in the best interest of the child is not sufficient to satisfy the requirements of this section.

(Enacted by Stats. 1992, Ch. 162, Sec. 10. Operative January 1, 1994.)