D.C. Code § 7-2502.01
Employees of United States Department of Agriculture authorized to carry firearms: Public Law 97-312 provided that any employee of the United States Department of Agriculture designated by the Secretary of Agriculture and the Attorney General of the United States may carry a firearm and use a firearm when necessary for self-protection, in accordance with rules and regulations issued by the Secretary of Agriculture and the Attorney General of the United States, while such employee is engaged in the performance of the employee's official duties to (1) carry out any law or regulation related to the control, eradication, or prevention of the introduction or dissemination of communicable disease of livestock or poultry into the United States or (2) perform any duty related to such disease control, eradication, or prevention, subject to the direction of the Secretary.
Seizure and forfeiture of conveyances used in firearms offenses: Section 2(b) of D.C. Law 11-273 provided for the forfeiture and seizure of any conveyance, including vehicles and vessels in which any person or persons transport, possess, or conceal any firearm as defined in § 7-2501.01 , or in any manner use to facilitate a violation of §§ 22-4503 and 22-4504 . D.C. Law 11-273 became effective on June 3, 1997.