18 U.S.C. § 930 - U.S. Code - Unannotated Title 18. Crimes and Criminal Procedure § 930. Possession of firearms and dangerous weapons in Federal facilities

(1) the lawful performance of official duties by an officer, agent, or employee of the United States, a State, or a political subdivision thereof, who is authorized by law to engage in or supervise the prevention, detection, investigation, or prosecution of any violation of law;

(2) the possession of a firearm or other dangerous weapon by a Federal official or a member of the Armed Forces if such possession is authorized by law;  or

(3) the lawful carrying of firearms or other dangerous weapons in a Federal facility incident to hunting or other lawful purposes.

(e)(1) Except as provided in paragraph (2), whoever knowingly possesses or causes to be present a firearm or other dangerous weapon in a Federal court facility, or attempts to do so, shall be fined under this title, imprisoned not more than 2 years, or both.

(2) Paragraph (1) shall not apply to conduct which is described in paragraph (1) or (2) of subsection (d).

(1) The term “Federal facility” means a building or part thereof owned or leased by the Federal Government, where Federal employees are regularly present for the purpose of performing their official duties.

(2) The term “dangerous weapon” means a weapon, device, instrument, material, or substance, animate or inanimate, that is used for, or is readily capable of, causing death or serious bodily injury, except that such term does not include a pocket knife with a blade of less than 2 1/2 inches in length.

(3) The term “Federal court facility” means the courtroom, judges' chambers, witness rooms, jury deliberation rooms, attorney conference rooms, prisoner holding cells, offices of the court clerks, the United States attorney, and the United States marshal, probation and parole offices, and adjoining corridors of any court of the United States.