It is simply an interrogation technique designed to get you to confess.
Been there and done that.
"Have you stolen supplies from your employer?"
No. "I see something, could you clarify?"
I have a few company ballpoints on my dresser that I forgot to put in my pocket before coming to work.
"Is there something else?"
Trying to get you to admit to that missing laptop and eventually they give up and pass you. It is all -------- to elicit confessions.
Really, if it worked all countries would be using it big time and there would be no spies.