In this section, “sunscreen” means a topical sunscreen product that is: Used to prevent the effects of overexposure to the sun and not for medical treatment of an injury or illness; and Approved by the federal Food and Drug Administration for over–the–counter use. Each county board shall adopt a written policy authorizing a student to possess and use sunscreen on school property or at a school–sponsored activity without written permission from a health care provider. Each county board shall encourage public schools to educate students about sunscreen, sun safety, and the policy established under subsection (b) of this section.