California Code, Business and Professions Code - BPC § 2630.3

(a) A licensed physical therapist assistant holding a valid, unexpired, and unrevoked physical therapist assistant license may assist in the provision of physical therapy services only under the supervision of a physical therapist licensed by the board.  A licensed physical therapist shall at all times be responsible for the extent, kind, quality, and documentation of all physical therapy services provided by the physical therapist assistant.

(b) It is unlawful for any person or persons to hold himself or herself out as a physical therapist assistant, unless at the time of so doing the person holds a valid, unexpired, and unrevoked physical therapist assistant license issued under this chapter, except as authorized in subdivisions (f) and (g) of Section 2630.5.

(c) Physical therapist assistants shall not be independently supervised by a physical therapist license applicant, as defined in Section 2639, or a physical therapist student, as defined in Section 2633.7.

(d) A physical therapist assistant shall not perform any evaluation of a patient or prepare a discharge summary.  The supervising physical therapist shall determine which elements of the treatment plan, if any, shall be assigned to the physical therapist assistant.  Assignment of patient care shall be commensurate with the competence of the physical therapist assistant.