Butterfly knives, also known as balisongs, are a type of folding knife with two handles that rotate around the tang of the blade. These knives have been used for centuries for various purposes such as hunting, fishing, and self-defense. However, due to their potential to be used as a weapon, the possession and carrying of butterfly knives is illegal in many places around the world.In the United States, the possession and carrying of butterfly knives is regulated by state laws. In some states, such as California, New York, and New Jersey, it is illegal to possess or carry a butterfly knife. In other states, such as Texas and Florida, it is legal to possess and carry a butterfly knife as long as it is not carried with intent to use it as a weapon. It's important to check the laws of your specific state regarding the possession and carrying of butterfly knives.In Canada, it is illegal to carry a butterfly knife with the intent to use it as a weapon. The possession of these knives is also restricted and regulated by law, and it is illegal to carry one in public places unless you have a valid reason, such as being a member of a knife collecting club.In the United Kingdom, it is illegal to carry a butterfly knife in public. The possession of these knives is also restricted and regulated by law, and it is illegal to carry one in public places.In Australia, butterfly knives are classified as prohibited weapons and it is illegal to possess, carry, or use one.In many European countries, it is illegal to carry a butterfly knife in public. The possession of these knives is also restricted and regulated by law.It's important to note that even if butterfly knives are legal to possess in your area, it may still be illegal to carry one in public or to use it as a weapon. It's always best to check your local laws before purchasing or carrying a butterfly knife.In conclusion, the possession and carrying of butterfly knives is illegal in many places around the world, including the United States, Canada, the United Kingdom, Australia, and many European countries. It's important to check your local laws before purchasing or carrying a butterfly knife to ensure you are following the law.