See this story for info. on the FBI warning about things like sword canes/umbreallas, belt buckle knives, key knives, and so on. See also the FBI Guide to Concealable Weapons (same thing at a second site).
Originally posted by Sharp Phil
What is disturbing about this story is that this crude, poorly constructed document was the best our own FBI could concoct.
Officials say a worker at the FBI lab in Quantico, Va., began the catalog shortly after the Sept. 11 attacks so that security personnel would be aware of the vast array of dangerous items that can be legally purchased and might be difficult to detect.