are there laws against carrying knives. I know you can't have them in school if the blade is longer than I think f inches, but I'm pretty sure that you could carry like a samurai sword around on the street, and you won't get any trouble.
It differs depending where you live. Here, it has to be under 6 inches, and if it's a fixed blade it's illegal if it's concealed. Also, if I brought a knife to school I'd get expelled and probably sent to juvie.