Semantics

I was checking in for a commercial flight over the bank holiday.
I approached the counter and handed over my passport and flight details.

The Check-in girl started her "before-you-get-a-boarding-card" spiel.

"Did you pack you bags yourself?", the check-in girl asked.
  "Yes", I replied
"Have you got anything sharp in your hand luggage?"
  "No", says I
"Could anyone have tampered with your bags without you knowing?", she asked

What was this??!

A trick question, especially designed by the "Bottom Inspectors"?

How was I supposed to answer that?

  "Of course they could have. But I wouldn't know!".

At which point I'd get frog-marched off to the "Rubber-Glove Brigade's" torture and humiliation den, or should I answer, "No".

At which point when I get a random search at X-ray the aforementioned unknown Tamperer's tamperings are discovered, and because I've already agreed that it couldn't be his fault I'm again frog-marched off to the "Bottom Inspectors' grotto"!

I decided to just shake my head and cross my fingers (and legs) at X-ray

:-)