a dangerous knife is not defined, and there in lies the problem. Intent to use as a weapon makes ANY knife a dangerous knife in NY. Certain designs ( bayonet, tanto, kriss, double edge blades) have been deemed to be weapons by design in NY. If you tell an officer that you carry your SAK for self defense, then it just became a dangerous weapon. A Captain in Queens told me how two of his officers arrested four men for having steak knives in their car. He questioned why they arrtesed the four, and the officers responded that the brand new pack of eight steak knives was open, and the four men stated they bought them for self defense since there were some people after them from a prior altercation. Lesson be learned it is a tool for a specific need or leave it at home....