18 U.S.C. § 930 — Possession of firearms and dangerous weapons in Federal facilities

(a) Except as allowed under subsection (d), anyone who knowingly brings, or causes to be brought, a firearm^* or other dangerous weapon into a federal facility — other than a federal court facility — or who attempts to do so, can be fined and imprisoned for up to 1 year, or both.

(b) If someone does that intending the weapon to be used to commit a crime, the penalty rises: a fine and up to 5 years in prison, or both.

(c) Anyone who kills a person while violating (a) or (b), or during an attack on a federal facility involving a firearm or other dangerous weapon, or who attempts or conspires to do so, is punished under the general federal murder and manslaughter laws.

(d) Subsection (a) does not apply to: an officer, agent, or employee of the United States, a state^*, or a political subdivision, who is legally authorized to prevent, detect, investigate, or prosecute violations of law, doing their official duties; a federal official or member of the Armed Forces carrying a firearm or weapon as legally authorized; or someone lawfully carrying a firearm or weapon into a federal facility for hunting or another lawful purpose.

(e) Except as described below, anyone who knowingly brings, or causes to be brought, a firearm or other dangerous weapon into a federal court facility, or who attempts to do so, can be fined and imprisoned for up to 2 years, or both. This rule does not apply to the same law-enforcement and military exceptions listed in subsection (d).

(f) Nothing in this section limits a federal court's power to punish for contempt, or to make its own rules restricting or banning weapons inside its building, during its proceedings, or on its grounds.

(g) Definitions. "Federal facility" means a building, or part of one, that the federal government owns or leases, where federal employees are regularly present to do their official duties. "Dangerous weapon" means a weapon, device, instrument, material, or substance — living or not — that is used, or is readily capable of being used, to cause death or serious bodily injury; it does not include a pocketknife with a blade under 2½ inches long. "Federal court facility" means the courtroom, judges' chambers, witness rooms, jury deliberation rooms, attorney conference rooms, prisoner holding cells, the offices of the court clerks, the U.S. Attorney, and the U.S. Marshal, probation and parole offices, and the corridors that adjoin any of these, in any U.S. court.

(h) Notice of the rules in subsections (a) and (b) must be posted clearly at every public entrance to a federal facility, and notice of the rule in subsection (e) must be posted clearly at every public entrance to a federal court facility. If that notice isn't posted, no one can be convicted under subsection (a) or (e) for that facility, unless the person actually knew about the rule anyway.