Notwithstanding any other law, a person holding a valid registration for a firearm may carry the firearm: (1) Within the registrant’s home; (2) While it is being used for lawful recreational purposes; (3) While it is kept at the registrant’s place of business; or (4) While it is being transported for a lawful purpose as expressly authorized by District or federal statute and in accordance with the requirements of that statute.
Authority to carry firearm in certain places and for certain purposes
D.C. Code § 22-4504.01 — under Weapons and Possession of Weapons..
D.C. Code § 22-4504.01