To state the obvious: a metal detector would catch these weapons. Presumably the new explosives sniffer machine would detect these. I am happy to walk through these machines in an organized fashion; I would even be willing to walk through such machines at train stations, subways, etc.

But the efforts being concentrated on shoes and on ID checks are largely wasted. I want the TSA or its successor agency to look at behavior and for combustible materials, not for nail clippers.