; (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; or (IV) to ensure the proper care and treatment of a specific patient. (5) Delivery A registered emergency medical services agency may deliver controlled substances from a registered location of the agency to an unregistered location of the agency only if— (A) the agency designates the unregistered location for such delivery; and (B) notifies the Attorney General at least 30 days prior to first delivering controlled substances to the unregistered location. (6) Storage A registered emergency medical services agency may store controlled substances— (A) at a registered location of the agency; (B) at any designated location of the agency or in an emergency services vehicle situated at a registered or designated location of the agency; or (C) in an emergency medical services vehicle used by the agency that is— (i) traveling from, or returning to, a registered or designated location of the agency in the course of responding to an emergency