D.C. Mun. Regs. tit. 24, § 2399
When used in this chapter, and in forms prescribed under this chapter, where not otherwise distinctly expressed or manifestly incompatible with the intent of the Act or this chapter, the following terms shall have the meanings ascribed:
Ballistics identification procedure – a process, approved by the Chief, undertaken to identify markings unique to a particular firearm or the ammunition used by the firearm.
Business premises – the property on which a licensed, deadly weapon dealer’s business is or will be conducted.
Certified firearms instructor – any person certified as a firearms instructor by the military or a state authority.
Chief – the Chief of the Metropolitan Police Department.
Dealer – any person engaged in the business of buying, selling, or otherwise dealing in firearms, ammunition, or destructive devices at wholesale or retail; any person engaged in the business of repairing, testing, or analyzing firearms; any person engaged in the business of making or fitting special barrels, stocks, or trigger mechanisms for firearms or destructive devices; or any person repairing, testing, analyzing, or making any destructive device or ammunition.
Director – the commanding officer or acting commanding officer of the Police Business Services Division of the Metropolitan Police Department or their delegates.
Explosive or explosives – any chemical compound or mechanical mixture that contains any oxidizing and combustible units, or other ingredients, in such proportion, quantities, or packing that an ignition by fire, friction, concussion, percussion, or detonator, or any part of the compound or mixture, may cause a sudden generation of highly heated gasses that results in gaseous pressures capable of producing destructive effects on contiguous objects or of destroying life or limb. (Art. 9, § 3 of the Police Regulations).
Firearms Registration Section – a part of the Police Business Services Division of the Metropolitan Police Department, located in 300 Indiana Avenue, N.W., Washington, DC 20001.
Home – the principal place of residence of an individual in the District and limited to the interior of a house, condominium unit, cooperative unit,
apartment, houseboat, or a mobile home, so long as that structure is not capable of unassisted movement. The term home does not include any common areas of any condominium unit, cooperative unit, or apartment.
Intrafamily offense – shall have the same meaning as provided in D.C. Official Code § 16-1001(8).
Law enforcement officer – any person authorized by a unit of government to carry a firearm on public space and who is responsible for, and under a duty to, detect crimes and apprehend offenders. A law enforcement officer is not a commissioner special police officer or the equivalent.
Licensed dealer – a deadly weapons dealer licensed under the Act and this chapter.
Pistol – any firearm originally designed to be fired by use of a single hand or with a barrel less than 12 inches in length.
Place of business – means a business that is located in an immovable structure at a fixed location and that is operated and owned entirely, or in substantial part, by the firearm registrant.
Supervisor – the person in charge of the Firearms Registration Section.
SOURCE: Final Rulemaking published at 23 DCR 8942 (May 6, 1977), incorporating text of the Proposed Rulemaking published at 23 DCR 7061 (March 4, 1977), 35 DCRR §301, November 1980, Special Edition; as amended by Article 9, §3 of the Police Regulations (May 1981); as amended by Notice of Emergency and Proposed Rulemaking published at 56 DCR 624 (January 16, 2009)[EXPIRED]; as amended by Notice of Final Rulemaking published at 56 DCR 4380, 4386 (June 5, 2009).