California Code, Business and Professions Code - BPC § 4980.02

(a) For the purposes of this chapter, the practice of marriage and family therapy shall mean the application of psychotherapeutic and family systems theories, principles, and methods in the delivery of services to individuals, couples, or groups in order to assess, evaluate, and treat relational issues, emotional disorders, behavioral problems, mental illness, alcohol and substance use, and to modify intrapersonal and interpersonal behaviors.

(b) The application of marriage and family therapy principles and methods includes, but is not limited to, all of the following:

(c) The amendments to this section made by the act adding this subdivision  1 do not constitute a change in, but are declaratory of, existing law. It is the intent of the Legislature that these amendments shall not be construed to expand or constrict the existing scope of practice of a person licensed pursuant to this chapter.