California Code, Health and Safety Code - HSC § 1797.56

“Authorized registered nurse,” “mobile intensive care nurse,” or “MICN” means a registered nurse who is functioning pursuant to Section 2725 of the Business and Professions Code and who has been authorized by the medical director of the local EMS agency as qualified to provide prehospital advanced life support or to issue instructions to prehospital emergency medical care personnel within an EMS system according to standardized procedures developed by the local EMS agency consistent with statewide guidelines established by the authority. Nothing in this section shall be deemed to abridge or restrict the duties or functions of a registered nurse or mobile intensive care nurse as otherwise provided by law.