This is more than bizarre. What exactly do they think they are achieving with this ? I can only assume that they think these moves will protect certain areas. So - let's all assume there's an infringment. Let's all assume that the ATC screens show a problem.
What then ?
If it's the bad boys, they will carry on unimpeded.
If it's the good guys, they will get prosecuted.
Hrrrrrrmmmph! Where the hell is the sense in all this "security" rubbish ?
Bit like travelling on commercial airlines. You go through all the checks, as a passenger, they ensure you're not carrying anything you shouldn't be. Then they allow you into the shopping mall on the otherside of security where you can buy explosive (perfume and other alcohol) and igniters (batteries) and a selection of "weapons" - and then get onboard with no checks.
Was at Zurich last weekend - there you can buy a Swiss Army knife just before boarding!