Cal. Education Code § 44839.5

(a) When a school district or county superintendent of schools wishes to employ a retirant who is retired for service, and such person has not been previously employed as a retirant, such district or county superintendent shall require, as a condition of initial employment as a retirant, a medical certificate in such form as shall be prescribed by the state board showing that the retirant is free from any disabling disease unfitting him or her to instruct or associate with children. The medical certificate shall be completed and submitted directly to the school district or county superintendent by a physician and surgeon licensed under the Business and Professions Code, a physician assistant practicing in compliance with Chapter 7.7 (commencing with Section 3500) of Division 2 of the Business and Professions Code, a licensed advanced practice registered nurse acting pursuant to standardized procedures and protocols in compliance with Chapter 6 (commencing with Section 2700) of Division 2 of the Business and Professions Code, or a commissioned medical officer exempted from licensure pursuant to federal law. A medical examination as prescribed by the State Board of Education shall be required for the completion of the medical certificate. Such examination shall be conducted not more than six months before the completion and submission of the certificate and shall be at the expense of the retirant. Notwithstanding Section 44031, the medical certificate shall become a part of the personnel record of the employee and shall be open to the employee or his or her designee. (b) The school district or county superintendent of schools which initially employed the retirant, or any school district or county superintendent which subsequently employs the retirant, may require a periodic medical examination by a physician and surgeon licensed under the Business and Professions Code, a physician assistant practicing in compliance with Chapter 7.7 (commencing with Section 3500) of Division 2 of the Business and Professions Code, a licensed advanced practice registered nurse acting pursuant to standardized procedures and protocols in compliance with Chapter 6 (commencing with Section 2700) of Division 2 of the Business and Professions Code, or a commissioned medical officer exempted from licensure pursuant to federal law, to determine that the retirant is free from any communicable disease unfitting him or her to instruct or associate with children. The periodic medical examination shall be at the expense of the school district or county superintendent. The medical certificate shall become a part of the personnel record of the retirant and shall be open to the retirant or his or her designee. (c) The state board shall adopt rules and regulations relating to the implementation and administration of this section.