Citation(s) from the GunPolicy.org literature library
District of Columbia. 2012 ‘D.C. Code Ann. § 7-2507.02(a). etc..’ Firearms Law Database - Firearm and Ammunition Storage Regulations in the District of Columbia. San Francisco, CA: Law Center to Prevent Gun Violence. 3 January
Firearm and Ammunition Storage Regulations in the District of Columbia
[T]he District of Columbia has established a strong, yet non-binding, policy that each firearm registrant should keep any firearm in his or her possession unloaded and either disassembled or secured by a trigger lock, gun safe, locked box, or other secure device.
The District does not require a locking device to accompany the sale of a firearm, although federal law applies…