I once watch TSA agents separate an older couple because the husband had a pacemaker and needed wanded. They left the wife with all of their bags, jackets, shoes, his cane and a few other items, began rifling through their carry on bags, took bags from the belt and put them about fifty feet away from her and refused to talk to her when she asked what was going on. They also chastised her because she was taking too long to get their things back together. It also too them more than 20 minutes to clear the husband through security.
I seriously believe they test people and hire only those who barely pass the intelligence tests.