While guns are the primary focus of the right to bear arms, there has been a smaller but potent movement to increase knife bearing rights in certain states. At first it may seem that knife rights are irrelevant, but investigating your local and state revised statues and codes is likely to find more than a few laws banning various knife types and blade lengths.
The New York Times  (Registration may be required to view) has a respectable article posted about the knife right movement.
Arizona used to be a knife carrier’s nightmare, with a patchwork of local laws that forced those inclined to strap Buck knives or other sharp objects to their belts to tread carefully as they moved from Phoenix (no knives except pocketknives) to Tempe (no knives at all) to Tucson (no knives on library grounds). But that changed earlier this year when Arizona made its Legislature the sole arbiter of knife regulations. Arizona’s transformation, and the recent lifting of a ban on switchblades, stilettos, dirks and daggers in New Hampshire, has given new life to the knife rights lobby, the little-known cousin of the more politically potent gun rights movement.