Thankfully, many ATMs in the UK use  a recess instead of a protrusion, so it should be more difficult to develop a device which fully fills the gap in a convincing manner.

The conversation goes something like this:

“Here,” dad to girl, “Get your ID out and have it with your ticket.”

“Excuse me, sir,” said the TSA officer, pointing to the young female, “She does not need to have her ID out, she’s a minor.”

Dad: “How do you know she’s a minor if you don’t look at her ID?”

…. (silence as everyone waits for answer)….

Dad again: “Kind of a hole in the system, isn’t it?”

TSA Officer, voice lowered … “There are a LOT of holes in the system, sir.” … walks away.

Young girl, “Good one, dad. Now tell her our name is LADEN and see what happens!”

Reminds me of the classic Kepner Tregoe quesiton; good, but good for what?