31 C.F.R. § 0.215 Possession of weapons and explosives.
Title 31 - Money and Finance: Treasury
(a) Employees shall not possess firearms, explosives, or other dangerous or deadly weapons, either openly or concealed, while on Government property or official duty. (b) The prohibition in paragraph (a) of this section does not apply to employees who are required to possess weapons or explosives in the performance of their official duties.
Title 31: Money and Finance: Treasury
PART 0—DEPARTMENT OF THE TREASURY EMPLOYEE RULES OF CONDUCT
Subpart B—Rules of Conduct
§ 0.215 Possession of weapons and explosives.