Thank you to those who have noticed updates to the law. I plan to visit soon on business and usually carry a folding pocket knife. I was looking for the information you gave me. The importation and possession of switch blades is illegal in Singapore. It also cannot be auctioned in Singapore.  Tennessee law does not distinguish between open and concealed carrying of knives. Any knife that can be legally worn openly can also be carried legally hidden. The same exceptions apply here: on school grounds and with the intention of arming oneself. Unfortunately, not personally knowing what law enforcement officers think and act, they would almost certainly consider this reason you have as MALITIOUS intent and not only take your knife, but also try to accuse you, my brother. As a husband and father/father, I fully understand and agree with your reason for wearing it. However, since I live here in the great state of Tennessee, I can tell you that this is not a good reason to give a law enforcement officer.
Good luck to you. Have a blessed day. You and your family. Are folding knives with a blade over 4″ legal if you have a valid license for hidden weapons? How old do you have to be at a farm sale to buy a knife? Can I sell to minors? The possibility of buying or transporting switch blades or automatic knives remains severely restricted or prohibited in much of Europe, with a few notable exceptions. In the UK, the foldable switch blade type is commonly referred to as a slide knife. In the UK, knives with an automated opening system are almost impossible to acquire or transport legally. Although they can be legally possessed, it is illegal to manufacture, sell, rent, give, lend or import such knives. This definition would theoretically limit legal ownership to “grandfathered” automatic knives that were already in the possession of their owner before the enactment of the law in force in 1959.
Even if such a knife is legal, carrying it in public without a valid reason or legal authority is also illegal under applicable UK law. All large side-opening switch blade knives (blade over 8.5 cm), OTF knives, Balisongs or butterfly knives (blade over 4 cm) and gravity knives are illegal under German law. Side-opening switch blade knives with single-edged blades not exceeding 8.5 cm and containing a continuous back are legal to own. Legal blades can be worn both openly and concealed on the body if there is a legitimate need or if the weapon is inaccessible with less than 3 movements (“transport in a locked container”). Other laws or regulations may prohibit the carrying of automatic knives or switch blade knives, particularly in certain situations or places (gatherings on public land, airport check-in areas). To go hunting, you can own most of Tennessee`s knives, including automatic knives, filing cabinets, and solid blades. The law here is quite simple. The problem is with the open vs hidden port – it`s confusing and unclear. We will come back to that.
First, let`s see what you can legally own. In 1950, an article entitled The Toy That Kills appeared in the Women`s Home Companion, a widely circulated American magazine of the time. The article sparked a firestorm of controversy and a nationwide campaign that would eventually lead to state and federal laws criminalizing the importation, sale and possession of self-opening knives. In the article, author Jack Harrison Pollack assured the reader that the growing “threat” of the Switchblade could have deadly consequences, “as any con man can tell you.”  Pollack, a former adviser to Democratic Senator Harley M. Kilgore and ghost writer for Senator Harry S. Truman, had written a series of melodramatic newspaper articles calling for new legislation to tackle various social ills. In The Toy That Kills, Pollack wrote that the Switchblade was “designed for violence, lethal as a revolver – it is the Switchblade that young `toys` across the country perceive as a fad. Press the button on this new version of the pocket knife and the blade sticks out like a snake`s tongue. Action must be taken against this murderer now.  In support of his accusations, Pollack quotes an unnamed juvenile judge who said, “There is only one step between wearing a switch blade and gang warfare.  I will go hunting! The question of the open port versus the concealed port is somewhat unclear. Tennessee`s latest laws in 2017 focus more on the issue of airline intent (see more on that below).
In short, neither overt nor hidden is illegal if your intent is not malicious. In other words, you can wear almost anything openly or not. Since the main spring constantly acts on the blade and is much more extensive and is stretched by the whole hand and arm and not the thumb, the force it can exert on the blade is greater than with a double-action knife. As a result, the tip of the blade can easily break the skin when used and possibly penetrate a few millimeters or penetrate light clothing. While it`s still not a very solid design, the front sheet shows less movement and play than its comparable dual-action counterpart because it`s more firmly attached. While knife laws do not restrict knives, some are more suspect than others. A Bowie knife, for example, is more likely to attract questions and concerns when carried openly. There are several exceptions, including law enforcement, school security personnel, and public servants performing their duties. Some positive defenses are available, including gun or knife displays approved by school officials or people entering the property with the vehicle to deliver or pick up passengers, provided the “weapon” remains in a vehicle. No, it is NOT the law. Switchblade knives are 100% legal to carry around in TN. I wear one every day.
Legal knives to possess in Tennessee -It is legal to possess a Bowie knife -It is legal to possess a dirty knife, dagger or other knives -It is legal to possess camouflaged knives such as pocket knives and loop knives -It is legal to possess a stiletto Tennessee is the 7th state where Knife Rights has lifted the ban on knives and other knives. That`s 18 legislative victories for Knife Rights in just over four years, including the rejection of four anti-knife laws. Knife Rights has passed 14 pro-knife laws in 11 states. Knife Rights Rewrites Knife Law in America™! I believe it is also illegal to carry a Dirk or dagger, even if the blade is less than four inches tall. I think it has been established that any double-edged sword is illegal. The push knife or dagger, most of which have a short three-inch blade, is also illegal. Understand that my information is old. I was a LEO many years ago and that was the interpretation back then (25+ years ago.
In France, 19th century folding knives called Châtellerault were available in automatic and manually opening versions in different sizes and lengths.  Châtellerault`s switch blades have recognizable features such as “S” shaped transverse guards, picklock mechanisms and decorative handles engraved with beads and ivory.  In Spain, Admiral D`Estaing is credited with a kind of foldable naval dirk, which was also used as tableware.  In the closed (folded) position, the tip of the blade would protrude beyond the handle for use at the dining table. It could be activated as a full-length side arm if needed by pressing a lever instead of a handle button.  In 1850, at least one American company offered a .22 rimfire pistol equipped with a spring-loaded knife.  After the Civil War (1865), knife production was industrialized.  The oldest mass-produced automatic knife in America is the Korn Patent Knife, which used a rocker-jaw trigger.  Under Part III of the Criminal Code, it is illegal to possess, import, sell, buy, exchange, or transport a person using a knife whose blade opens automatically by gravity or centrifugal force or by hand pressure applied to a button, spring, or other device attached to the handle of the knife. These are forbidden weapons.  While some businesses may obtain a licence to acquire and possess prohibited weapons, such as switch blades, for use as props in film productions, these exemptions do not apply to individuals.