D.C. Code § 1-303.43: Regulations relative to firearms, explosives, and weapons.

The Council of the District of Columbia is hereby authorized and empowered to make, and the Mayor of the District of Columbia is hereby authorized and empowered to enforce, all such usual and reasonable police regulations, in addition to those already made under §§ 1-303.01 to 1-303.03 as the Council may deem necessary for the regulation of firearms, projectiles, explosives, or weapons of any kind in the District of Columbia.