Cal. Bus. & Prof. Code § 6155
(a) An individual, partnership, corporation, association, or any other nongovernmental entity shall not operate for the direct or indirect purpose, in whole or in part, of referring potential clients to attorneys, and no attorney shall accept a referral of such potential clients, unless all of the following requirements are met:
(c) None of the following is a lawyer referral service:
(2) A group or prepaid legal plan, whether operated by a union, trust, mutual benefit or aid association, public or private corporation, or other entity or person, which meets both of the following conditions:
(d) The following are in the public interest and do not constitute an unlawful restraint of trade or commerce:
(e) With the approval of the Supreme Court, the State Bar shall formulate and enforce rules and regulations for carrying out this section, including rules and regulations which do the following:
(f) Provide that cause for denial of certification or recertification or revocation of certification of a lawyer referral service shall include, but not be limited to:
(g) This section shall not be construed to prohibit attorneys from jointly advertising their services.
(1) Permissible joint advertising, among other things, satisfies both of the following: