Which is the biggest problem, the TSA does not have to follow its own rules. And if you dare point out the rules to them, you will be told that "for your safety and security" individual screening is "up to the agent's discretion" and asked "do you want to fly today" while also being loudly informed that you obviously "do not care about the security of others."
This is why I am such a huge advocate for trains, though I imagine that if rail got more usable and widespread here the TSA would just infest it as well. Until that happens, I will always take a train for short regional trips. SEA to PDX might be scheduled for 45 minutes on the plane and 3 scheduled hours on the train, but the experience is so much better on Amtrak not having to put up with the sad mess our airports are.