Cal. Bus. & Prof. Code § 2538.1
(b) The board shall adopt regulations as reasonably necessary to carry out the purposes of this article, that shall include, but need not be limited to, the following:
(4) The scope of responsibility, duties, and functions of speech-language pathology assistants, that shall include, but not be limited to, all of the following:
(I) Assisting with speech-language pathology research projects, in-service training, and family or community education.
The regulations shall provide that speech-language pathology assistants are not authorized to conduct evaluations, interpret data, alter treatment plans, or perform any task without the express knowledge and approval of a supervising speech-language pathologist.