; and (C) addressing the ability of hospitals, registered locations, and designated locations to deliver controlled substances to each other in the event of— (i) shortages of such substances; (ii) a public health emergency; or (iii) a mass casualty event. (12) Rule of construction Nothing in this subsection shall be construed— (A) to limit the authority vested in the Attorney General by other provisions of this title to take measures to prevent diversion of controlled substances; or (B) to override the authority of any State to regulate the provision of emergency medical services. (13) Definitions In this section: (A) The term designated location means a location designated by an emergency medical services agency under paragraph (5). (B) The term emergency medical services means emergency medical response and emergency mobile medical services provided outside of a fixed medical facility. (C) The term emergency medical services agency means an organization providing emergency medical services, including such an organization that— (i) is governmental (including fire-based and hospital-based agencies), nongovernmental (including hospital-based agencies), private, or volunteer-based; (ii) provides emergency medical services by ground, air, or otherwise