Ok, while on the face of it this story about a knife getting through airport security is a bit worrying (if not particularly surprising), it's the other part of the story that has me thrown:

[Katrina Bell, 27,] had put the knife in her bag "just in case" before going on a blind date earlier that week, her sister and travel companion, Tikisha Bell Gowens, 30, said in The Sunday Star-Ledger of Newark.

Yeah, what a great idea! I'll stick a big horking knife in my bag. There's no chance I'll fall down, or bump into something, or reach the wrong way and hack a finger off. Nope, no chance at all.