Haha! Yup, they are legal to own and to travel with in all but four U.S. states (just like wearing a knife on one's belt is legal in most places). So long as one is not beating people up or destroying another's property no laws are being broken. But just like with a gun, when I saw them nearby (watching me, I was kind of "street performing") I respectfully approached them to show them the chucks, and the sai I had on me, allowed them to inspect if desired, and went back to what I was doing. Thanks!