California Code of Civil Procedure > Code Civ. Proc. §116.531. Assistance and Testimony of Experts
Nothing in this article shall prevent a representative of an insurer or other expert in the matter before the small claims court from rendering assistance to a party in the litigation except during the conduct of the hearing, either before or after the commencement of the action, unless otherwise prohibited by law; nor shall anything in this article prevent those individuals from testifying to facts of which they have personal knowledge and about which they are competent to testify.