OK, here's a problem I've lost sleep over: if a blade is borderline legal (say 4", which I know is technically legal in most states, but has been known to raise the ire of security guards......) and carried abroad a plane in hand luggage, undetected by x-rays, is it being "smuggled" aboard? In other words - and please excuse rambling writing style - by not calling it to the attention of security guards, have I committed any sort of crime? Should I have alerted the guard? Also, and I guess this sort of follows, am I then in trouble if it is "found" sometime in the course of my trip, either on board the plane or at another airport? Can I be charged with anything for simply having carried it on board, even though I did not carve up anyone or perform any other mayhem? Am also curious if this same reasoning might apply to blades that have no magnetic "foot print" - like titanium, nylon/glass, etc.? What happens if I carry one of them and it is later found in my bag? Thanks in advance for any advice.