Cal. Bus. & Prof. Code § 2069
(a)
(2) The supervising physician and surgeon may, at his or her discretion, in consultation with the nurse practitioner, certified nurse-midwife, or physician assistant, provide written instructions to be followed by a medical assistant in the performance of tasks or supportive services. These written instructions may provide that the supervisory function for the medical assistant for these tasks or supportive services may be delegated to the nurse practitioner, certified nurse-midwife, or physician assistant within the standardized procedures or protocol, and that tasks may be performed when the supervising physician and surgeon is not onsite, if either of the following apply:
(b) As used in this section and Sections 2070 and 2071, the following definitions apply:
(3) “Supervision” means the supervision of procedures authorized by this section by the following practitioners, within the scope of their respective practices, who shall be physically present in the treatment facility during the performance of those procedures:
(4)
(c) Nothing in this section shall be construed as authorizing any of the following: