It's completely token security. Every single detector goes off for every person going through. And the questions they ask you? Ridiculous. "Do you have anything in your pockets?" Of course I do. So, do they change their response to your answer? No. And they shouldn't. Because everybody carries metal things.
And the whole raising your cellphone and wallet over your head? The only thing it does is see who is compliant with their requests, because it doesn't stop the detector going off, and doesn't show you have nothing else in your pocket.
There is absolutely nothing this accomplishes except limiting liability. If it was effective, I may have a different opinion on this, but the amount of inconvenience and assumption that an unchecked person is a dangerous person, is in no way worth the cost. No matter how insignificant.
No one gains but the lawyers.
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