Originally Posted by
exerda
Definitely the shank, and not random other metal. There isn't enough in the nails or lace grommets or anywhere else you might have metal in your shoes, unless the WTMD sensitivity is cranked insanely high.
I am fortunate that most of my shoes lack a shank and thus do not alarm. Given Pre these days sends you to the Nude-o-Scope when you alarm, that's a big deal.
My Allen Edmonds shoes don't set off the WTMD, FWIW.
I've wondered about this, but never witnessed it. What happens with shoes if you are in a Pre line and get sent to the NoS?
I always remove my shoes before I approach the TDC and when I randomly set off the WTMD, I get a grope. The question has never come up because I am already barefoot.