; and (B) may deny an application for such registration if the Attorney General determines that the issuance of such registration would be inconsistent with the requirements of this subsection or the public interest based on the factors listed in subsection (f). (2) Option for single registration In registering an emergency medical services agency pursuant to paragraph (1), the Attorney General shall allow such agency the option of a single registration in each State where the agency administers controlled substances in lieu of requiring a separate registration for each location of the emergency medical services agency. (3) Hospital-based agency If a hospital-based emergency medical services agency is registered under subsection (f), the agency may use the registration of the hospital to administer controlled substances in accordance with this subsection without being registered under this subsection. (4) Administration outside physical presence of medical director or authorizing medical professional Emergency medical services professionals of a registered emergency medical services agency may administer controlled substances in schedule II, III, IV, or V outside the physical presence of a medical director or authorizing medical professional in the course of providing emergency medical services if the administration is— (A) authorized by the law of the State in which it occurs; and (B) pursuant to— (i) a standing order that is issued and adopted by one or more medical directors of the agency, including any such order that may be developed by a specific State authority; or (ii) a verbal order that is— (I) issued in accordance with a policy of the agency; (II) provided by an authorizing medical professional in response to a request by the emergency medical services professional with respect to a specific patient; (III) in the case of a mass casualty incident