All knives that are not illegal can be legally purchased, owned and used by anyone on private property. However, some knives cannot be transported in public, which is defined as the exercise of real control over a restricted class knife outside the home, business or private property.  It is illegal to carry a knife to use as a weapon of attack or defense. The only general limitation is the intended use, not the characteristics of the knife itself (in particular, despite popular belief, there is no limitation on the length of the blade). In practice, however, there will be considerable room for interpretation for police officers and judges – and much will depend on whether a use other than that of a weapon can be argued – for which the characteristics of the knife in question will be very relevant (bad: flick knife, automated, long blade, knife on the neck, tactical). Thus, carrying a knife, which is mainly used as a weapon, will be illegal. In addition, it is not allowed to carry knives in certain places such as courtrooms, football matches, etc. Wearing knives is usually very unusual in cities, but not in the countryside. The purchase and possession of knives is limited by double-edged knives, automatic (openly supported) knives, and weapons such as swords. The carrying of knives is only allowed for a «good reason», for example for camping, fishing, etc.; Usually not in cities – and never for self-defense. Otherwise, only «transport» is allowed, not «at hand», but at the bottom of your backpack, etc. Under the Switchblade Knife Act of 1958 (amended in 1986, codified as 15 U.S.C. §§1241–1245), control blades and ballistic knives are prohibited from supplying, selling, importing, or possessing between states in the following areas: any territory or possession of the United States, that is, lands owned by the federal government; Indian lands (as defined in Section 1151 of Title 18); and territories under the maritime or territorial jurisdiction of the Federal Government, with the exception of federal authorities, state criminal prosecution authorities and the military. In addition, federal laws may prohibit the possession or carrying of knives on certain federal properties, such as courthouses or military installations. U.S. federal switching blade laws do not apply to the possession or sale of switching blade knives within a state; The latter shall be governed by the laws of that particular State, if any. No licence is required for the import, trade or transport of knives for these purposes (Art. 7, 5). The German knife law provides some amusing details. It`s illegal to carry a 5-inch kitchen knife, but you can legally carry any bad-ace combat knife as long as the blade length doesn`t exceed the 12 cm (4.72-inch) limit (except Karambits!). The Connecticut Supreme Court ruled in State v. DeCiccio (2014) that Dirkmesser and police batons are protected by the Second Amendment.   Over the years, state court decisions have expanded the original scope of switching blade laws, either by reclassifying automatic single-edged pocket knives with short, universal blades as illegal «dirks or daggers,» or by redefining otherwise legal hand-locked blade pocket knives as gravity knives, rocking knives or switching blades prohibited.    People who used knives considered prohibited, for example in their work or self-defence, or who did not have the means to afford adequate legal representation, particularly racial minorities, were disproportionately affected by the capricious application of these laws.  Under Norwegian law, you can spend up to 6 months in prison if you intentionally bring a knife or similar sharp tool that is particularly suitable for causing bodily harm in a public place or helping others do so. The law does not apply to knives or other tools worn or used for work, outdoor activities or similar serious purposes. Note that this includes bringing knives in your own car. It is also illegal to buy, own or store switching blade knives, butterfly knives and stiletto heels.  In the United States, the commercial development of the switching blade knife was mainly dominated by the inventions of George Schrade and his New York Press Button Knife Company, although W.R. Case, Union Cutlery, Camillus Cutlery and other American knife manufacturers have also marketed automatic knives of their own design.  Most of Schrade`s blade models were automatic versions of utility-oriented jack knives and pocket knives, as well as smaller pocket knife models designed to appeal to buyers. In 1903, Schrade sold his shares in the New York Press Button Knife Co. to the Walden Knife Co.
and moved to Walden, New York, where he opened a new factory.   There, Schrade became the company`s production manager and established a production line to produce various samples of schrade-designed switching blade knives, ranging from a large folding hunter to a small pocket knife.  Walden Knife Co. has sold thousands of copies of Schrade`s original Bolster button design.   Minor use knives may be transported if they are transported in a sealed sealed container or if there is a generally accepted legitimate purpose for their transportation, such as participation in a historical re-enactment, sporting use (e.g., hunting) or as a necessary tool in a business or store.  The desire to defend oneself or to use the knife as a tool without proof of necessity for its use is generally not considered a legitimate purpose under the law.  Any type of Balisong and OTF is strictly prohibited.