U7-Medic012

So I have seen these little knives that can be stored in your boot or around your leg called last ditch knives.Does anyone know if these are legal to carry in NJ ? I know EMT's dont have legal reasons to arm themselves even though I'm hoping that day will come.I've tried searching google for knife laws but it refers more to switch blades and larger knives like daggers and stuff.Any help is greatly appreciated.