Weapons and explosives
Primary source
Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.
Full Text
Except in connection with the conduct of official business on the site, no person other than uniformed guards specifically authorized, or other Federal, State, or local law enforcement officials so authorized, shall carry, transport, or otherwise possess on the site, firearms whether loaded or not, other dangerous or deadly weapons or materials, or explosives, either openly or concealed, without the written permission of the Director or his designee.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.