from the video "police say a knivfe is illegal if ... it can be opened with one hand"
thats not true, only illegal knives are spring or centrafugal (sp?) force which implies butterfly knives. perhaps they dumbed it down for viewers.
is this still airsoft-relate?
edit- now that i think about it, was there a provision about gravity assisted knives that were illegal? then that last knife they showed should fall under that.