I saw a pile of them my self once in a TSA basket, along with nail files and other stuff you couldn't take over a plane with. Obviously, it was at its peak post 9:11 and I believe they don't bother with nail clippers, etc now, that or a short time they took 'till specific standards developed, but this was like a year after 9:11 and pretty much everything was taken short of your gold teeth.
But those 12" aluminum sharp needles, those were OK....blew my mind