From BladeHQ's website
8. Automatic Knife Laws & Assisted Knife Laws. The Switchblade Act, (Pub.L. 85-623, 72 Stat. 562, enacted on August 12, 1958, and codified in 15 U.S.C. § 1241–1245), as may be amended, (the “Act”
prohibits shipment of automatic knives across state lines, with the following exceptions:
(a) to civilian or Armed Forces supply or procurement officers and employees of the Federal Government ordering, procuring, or purchasing such knives in connection with the activities of the Federal Government;
(b) to supply or procurement officers of the National Guard, the Air National guard, or militia of a state, territory or the District of Columbia ordering, procuring, or purchasing such knives in the connection with the activities of such organization;
(c) to supply or procurement officers or employees of the municipal government of the District of Columbia or the government of any State or Territory, or any county, city or other political subdivision of a State or Territory;
(d) to manufacturers of such knives or bona fide dealers therein in connection with any shipment made pursuant of an order from any person designated in paragraphs (a), (b), and (c).
