California Code, Health and Safety Code - HSC § 120380

It is the intent of the Legislature that the administration of immunizing agents by registered nurses in school immunization programs under the direction of a supervising physician and surgeon as provided in Sections 49403 and 49426 of the Education Code shall be in accordance with accepted medical procedure. To implement this intent, the department may adopt written regulations specifying the procedures and circumstances under which a registered nurse, acting under the direction of a supervising physician and surgeon, may administer an immunizing agent pursuant to Sections 49403 and 49426 of the Education Code.

However, nothing in this section shall be construed to prevent any registered nurse from administering an immunizing agent in accordance with Sections 49403 and 49426 of the Education Code in the absence of written regulations as the department is authorized to adopt under this section.