Editing Switchblade (section)

==== Federal law ====
The ''Switchblade Knife Act'' ({{USPL|85|623}}, {{USStat|72|562}}, aka ''SWA'', enacted on August 12, 1958, and codified in {{USC|15|1241|1245}}) prohibits the manufacture, importation, distribution, transportation, and sale of switchblade knives in commercial transactions [[Commerce Clause|substantially affecting interstate commerce]]<ref>In ''Gibbons v. Ogden'', the U.S. Supreme Court first established the principle that Congress may regulate under the [[Commerce Clause]] of the Constitution only those activities within a state that arise out of or are connected with a commercial transaction, which viewed in the aggregate, substantially affect interstate commerce.</ref> between any state, territory, possession of the United States, or the District of Columbia, and any place outside that state, territory, U.S. possession, or the District of Columbia. The Act also prohibits possession of such knives on federal or Indian lands or on lands subject to federal jurisdiction. The federal SWA does ''not'' prohibit the ownership or carrying of automatic knives or switchblades inside state lines while not on federal property, nor does it prohibit the acquisition or disposition of such knives in  an intrastate (in-state) transaction.  Finally, the law does not prohibit interstate knife sales or transactions that are either noncommercial in nature, or which do not substantially affect interstate commerce (as defined by recent decisions of the U.S. Supreme Court).

U.S. Code Title 15, Sect. 1241 defines switchblade knives as any knives which open "1) by hand pressure applied to a button or other device in the handle of the knife, or any knife having a blade which opens automatically; (2) by operation of inertia, gravity, or both". The Act also prohibits the manufacture, sale, or possession of switchblade knives on any Federal lands, Native American reservations, military bases, and Federal maritime or territorial jurisdictions including the District of Columbia, Puerto Rico, and other territories.<ref name="Walker">Walker, Greg (1993). ''Battle Blades: A Professional's Guide to Combat/Fighting Knives'' (Hardcover), pages 210 {{ISBN|0-87364-732-7}}</ref><ref>Title 15, Ch. 29, § 1241 United States Code (Definitions): The term “interstate commerce” means commerce between any State, Territory, possession of the United States, or the District of Columbia, and any place outside thereof.</ref> The act was amended in 1986 to also prohibit the importation, sale, manufacture, or possession of [[Ballistic knife|ballistic knives]] in interstate commerce.

U.S.C. 1716 prohibits the mailing or transport of switchblades or automatic knives through the U.S. mails ([[U.S. Postal Service]]), with a few designated exceptions.<ref name="Walker"/> The act provides for a fine and/or imprisonment of not more than one year.<ref name="Walker"/> {{USC|18|1716(g)(2)}} provides:

{{blockquote|{{ordered list|start=7|list_style_type=lower-alpha
| All knives having a blade which opens automatically (1) by hand pressure applied to a button or other device in the handle of the knife, or (2) by operation of inertia, gravity, or both, are nonmailable and shall not be deposited in or carried by the mails or delivered by any officer or employee of the Postal Service. Such knives may be conveyed in the mails, under such regulations as the Postal Service shall prescribe —{{ordered list|
| 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;
| 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;
| 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; procuring or purchasing such knives in connection with the activities of such government.
| 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 (1), (2), and (3).}}}}}}

{{USC|15|1244}} provides that the federal ''Switchblade Knife Act'' does '''not''' apply to: 1) any common carrier or contract carrier, with respect to any switchblade knife shipped, transported, or delivered for shipment in interstate commerce in the ordinary course of business; 2) the manufacture, sale, transportation, distribution, possession, or introduction into interstate commerce of switchblade knives pursuant to contract with the Armed Forces; 3) to the Armed Forces or any member or employee thereof acting in the performance of his duty; 4) the possession and transportation upon his person of any switchblade knife with a blade {{convert|3|in|cm|abbr=on}} or less in length by any individual who has only one arm, and 5) a knife "that contains a spring, detent, or other mechanism designed to create a bias toward closure of the blade and that requires exertion applied to the blade by hand, wrist, or arm to overcome the bias toward closure to assist in opening the knife".<ref name="Walker"/>