; (B) if the individual has authority to operate an unmanned aircraft system under other Federal law, the requisite proof of authority under that law; or (C) an airmen certificate issued under section 44703. (2) Coordination The Administrator may coordinate the identification number under paragraph (1)(A) with an operator's registration number to the extent practicable. (3) Limitation No fine or penalty may be imposed for the initial failure of an operator of an unmanned aircraft system to comply with paragraph (1) unless the Administrator finds that the conduct of the operator actually posed a risk to the national airspace system. . (b) Table of contents The table of contents for chapter 448, as amended by section 2128 of this Act, is further amended by inserting after the item relating to section 44808 the following: 44809. Aeronautical knowledge and safety test. . 2131. Treatment of unmanned aircraft operating underground An unmanned aircraft system that is operated underground for mining purposes shall not be subject to regulation or enforcement by the Federal Aviation Administration under chapter 448 of title 49, United States Code. 2132. Enforcement (a) UAS safety enforcement The Administrator of the Federal Aviation Administration shall establish a program to utilize available remote detection and identification technologies for safety oversight, including enforcement actions against operators of unmanned aircraft systems that are not in compliance with applicable Federal aviation laws, including regulations. (b) Civil penalties (1) In general Section 46301 is amended— (A) in subsection (a)(1)(A), by inserting chapter 448, after chapter 447 (except sections 44717 and 44719–44723), ; (B) in subsection (a)(5), by inserting chapter 448, after chapter 447 (except sections 44717–44723), ; (C) in subsection (d)(2), by inserting chapter 448, after chapter 447 (except sections 44717 and 44719–44723),