Originally Posted by
SnallaBolaget
It's a well-known fact that absolutely every single modern model of "WTMD"s can "randomly" select a set percentage of persons walking through, either simulating an alarm, or discretely show a light-warning to the person operating it.
You can read this in any product sheet or user's manual for any of the portals.
Makes sense.
For a second I though the TSOs could just do their jobs without a machine telling them how, but them I remembered TSOs can't think for themselves...