Cal. Bus. & Prof. Code § 2530.6

Speech-language pathologists and audiologists supervising speech-language pathology or audiology aides shall register with the board the name of each aide working under their supervision. The number of aides who may be supervised by a licensee shall be determined by the board. The supervising audiologist or speech-language pathologist shall be responsible for the extent, kind, and quality of services performed by the aide, consistent with the board’s designated standards and requirements.