There have always been methods to skirt laws on these sorts of things. My personal favorite from a conceptual standpoint was the knife, whose sheath dropped awa

There have always been methods to skirt laws on these sorts of things. My personal favorite from a conceptual standpoint was the knife, whose sheath dropped away, rather than the blade coming out. https://www.google.com/patents/US4523379 https://www.google.com/patents/US4523379