DC Official Code § 7-2507.05 (a)
If a person or organization within the District voluntarily and peaceably delivers and abandons to the Chief of Police any firearm, destructive device or ammunition at any time, such delivery shall preclude the arrest and prosecution of such person on a charge of violating any provision of this section with respect to the firearm, destructive device, or ammunition voluntarily delivered. Delivery under this section may be made at any police district, station, or central headquarters, or by summoning a police officer to the person’s residence or place of business. Every firearm and destructive device to be delivered and abandoned to the Chief under this section shall be unloaded and securely wrapped in a package, and, in the case of delivery to a police facility, the package shall be carried in open view. No person who delivers and abandons a firearm, destructive device, or ammunition under this section, shall be required to furnish identification, photographs or fingerprints. No amount of money shall be paid for any firearm, destructive device, or ammunition delivered and abandoned under this section.
(b) Whenever any firearm, destructive device, or any ammunition is surrendered under this section or pursuant to § 7-2502.10(c)(1), the Chief shall inquire of the United States Attorney and the Corporation Counsel for the District whether such firearm is needed as evidence; provided, that if the same is not needed as evidence, it shall be destroyed.