Umm... I'm pretty sure that these are legal, the arent assisted like with switchblades (which are illegal) pretty sure that automatic knives are illegal. It's best to check up with your state laws and age restrictions e.g. under a certain age is only allowed 3.5 inch blades. Apart from that the only other thing I know is karambits are illegal. So I think if the knife is only technically used as a weapon, or if its automatic. I'm not 100 percent sure.