[KarlInOhio]

Do they not have anyone watching people put their fingers on the scanner? Forget tape, you could just have someone else put their finger on the scanner if you don't have anyone watching?

[BigBobber]

The officers need to visually inspect the person’s fingers before they put them on the scanner. Easy solution.

I went through U.S. customs a few weeks ago and they made people put their thumb and then all four fingers on the scanner.