PHOENIX — 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. And because of loose restrictions on weapons here, Arizona is now considered a knife carrier’s dream, a place where everything from a samurai sword to a switchblade can be carried without a quibble.

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. Its vision is a knife-friendly America, where blades are viewed not as ominous but as tools — the equivalent of sharp-edged screw drivers or hammers — that serve useful purposes and can save lives as well as take them.

Sure, knife fights and knife attacks are a concern. No knife-lover would ever deny that. In fact, Todd Rathner, the lobbyist for Knife Rights Inc., an advocacy group based in Arizona that is now in its third year, was mugged twice in New York City before moving to Tucson, once — “ironically,” he said — at knifepoint.