It's always a hassle with illegal weapons. Laws vary, not only from state to state, but also from county to county. That's why we make such a big point of saying "check your local laws" especially with nunchuku. 'Intention' is a big issue. A baseball bat or a broomstick can be considered a weapon if the arresting officer determines intention to cause bodily harm. Of course, a sword is more obvious, since given the nature of the object, you're brandishing it just to be carrying it (can't sweep the flor with a sword really).

A swordmaker friend of mine had sent me a link to this Vitocria article and I was about to post it when the link came up 'not found'. I'm glad Radhnoti found another version.