After September 11, 2001, the FBI started collecting small, easily concealed knives and other potentially lethal objects, and compiled a catalog that has been distributed to airport screeners and law enforcement agencies across the country. This reprint shows metal, plastic and ceramic knives hidden in pens, keys, belt buckles, jewelry, canes and cigarette lighters, as well as impact weapons disguised as keychains, and items hollowed out for the possible concealment of explosives. The book also contains photos of each weapon along with a brief description, scales for size reference and in many cases X-ray images to show how the item might look if passed through a scanning device.