Interesting, this one!
Not long ago I started a thread pointing out how one major (unnamed) european hub had the farcical situation whereby one was relieved of anything sharp at check-in or the main security checkpoint, and yet one could then proceed to the airside McDonalds and load up with any number of serrated metal knives and forks and go straight on to a plane without any further checks.
Mysteriously my thread was deleted within a few hours, but I could not help but notice on more recent trips through Schiphol (for thus it was...) that (a) the metal knives remain at McDonalds but (b) gate security checks had been introduced in addition to the main one.
Could this be why yesterday's BD pax were required to be screened again? They all gone to spend their meal vouchers at McDs...........