It's absolutely security theater.
This doesn't sound possible to me. Do you have a source?
It's such a bad joke.
A few years ago I went through an airport that had a dog checking everyone. The handler was struggling to get the dog to do his job, people were not being checked, dog / puppy just wanted to play.
Once there was a woman in front of me who asked why we take our shoes off and the response was "Once someone put a bomb in there shoes."
1. I don't love remedies to problems that happened once.
2. We had an international pandemic once... by your logic shouldn't we always mask at the airport?
Post-pandemic it's become a highly political thing now and depending on where your at you may get some unfriendly looks.