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

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.