; (C) authorized by Federal, State, or local law to carry a firearm, execute search warrants, and make arrests; and (D) recognized, commissioned, or certified by a government entity as a law enforcement officer. ; and (2) by adding at the end the following: (aa) Secure storage or safety device requirement for grandfathered semiautomatic assault weapons It shall be unlawful for any person, other than a licensed importer, licensed manufacturer, or licensed dealer, to store or keep under the dominion or control of that person any grandfathered semiautomatic assault weapon that the person knows, or has reasonable cause to believe, will be accessible to an individual prohibited from receiving or possessing a firearm under subsection (g), (n), or (x), or any provision of State law, unless the grandfathered semiautomatic assault weapon is— (1) carried on the person, or within such close proximity that the person can readily retrieve and use the grandfathered semiautomatic assault weapon as if the grandfathered semiautomatic assault weapon were carried on the person