Support BladeForums! Paid memberships don't see ads! The only United States law regarding auto-open (automatic) knives is referred to as the Federal Switchblade Act. The act regulates the manufacture and introducing of switchblades into interstate (crossing state lines) commerce. It has NO application to individual consumers, or most merchants who sell knives. It has NO application to laws WITHIN a state. The legislation (Public Law 85-623) was passed August 12, 1958 and incorporated into law in two sections. The first section prohibits importation and interstate commerce of switchblades or gravity knives and the second section prohibits automatics from being mailed through the U.S. Postal Service. Source is the American knife and tool institute. So how does quantity of Chinese balisongs and switchblades get into the markets such as flea markets and gas stations?