If you want good security theater, just install some fancy looking machine that makes cool noises and every once in a while directs someone for a personal scree

If you want good security theater, just install some fancy looking machine that makes cool noises and every once in a while directs someone for a personal screening (regardless of whether they should be pulled out of line or not). Also have a trained pro sitting on the sidelines pulling out people he finds suspect. At a later point, maybe you can replace the fancy looking stuff with equipment that actually does something.