Rule #1, you NEVER carry a knife for "self defense/personal protection" in nyc as that is an automatic crime (absurd isnt it).Non-locking? So they would rather have the knife close on the victim's fingers if the need for self defense arises. Well, at least the assailant will be safer!
No dirks, daggers, switch blades, gravity knives (anything flickable) or anything over 4".
It must be CONCEALED, which means no exposed pocket clip (you know the sheep are easily scared).