Even that could be accounted for. If you have 'questionable' items, security could ask that you leave them at the front desk, and you can pick them up on your way out.
At this point they'd have to start worrying about bulky clothing as well. It was hot outside in this instance, but in cooler weather/climates you'd need to go full TSA-mode on everybody entering the building.
That's practical for some installations, but not many.
