Here is the Federal law.
(a)Unlawful Conduct.—Except as provided in subsection (b), it shall be unlawful for any person knowingly—
(1)to develop, produce, otherwise acquire, transfer directly or indirectly, receive, stockpile, retain, own, possess, or use, or threaten to use, any chemical weapon; or
(2)to assist or induce, in any way, any person to violate paragraph (1), or to attempt or conspire to violate paragraph (1).
(1)In general.—Subsection (a) does not apply to the retention, ownership, possession, transfer, or receipt of a chemical weapon by a department, agency, or other entity of the United States, or by a person described in paragraph (2), pending destruction of the weapon.
(2)Exempted persons.—A person referred to in paragraph (1) is—
(A)any person, including a member of the Armed Forces of the United States, who is authorized by law or by an appropriate officer of the United States to retain, own, possess, transfer, or receive the chemical weapon; or
(1)takes place in the United States;
(4)is committed against any property that is owned, leased, or used by the United States or by any department or agency of the United States, whether the property is within or outside the United States.