Not what you asked about but related to current airport security.
Last time I was in an airport, Heathrow, I was seeing a niece off. She was going permanently.
As she was going into the departures, I was waving and holding a bag. She ran back to me for one last hug. I droped the bag to return it.
I was approached from two diffrent directions by security people, saying, Pickup the bag, pick up the bag, pick up the bag.......
Honestly, I could have screemed. What possible extra risk had I posed?