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Not agreeing with them, but you misread what they said. They said that PreCheck itself was a self-selecting list of "evildoers" (i.e. the only people who pay for it are up to no good).

As I said, I don't agree, but that's what they posted.

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To clarify, I meant that vast majority of evil doers would pay $85 for less screening (alongside a lot of normal people).

While doing thorough background checks on all travelers is an impossible task, it might possible to do thorough checks on all Pre-Check members. This could be worth it for the TSA, even if 99% of PreCheck members are good.

I read it that way at first, but then went the other way because it makes no sense -- there's so little difference in screening between lines, why would a terrorist invite more scrutiny months before they are ready to act?

Besides, an organized terrorist cell is not going to bring their bomb through security anyway, they are going to bring it in on a catering truck or one of the other thousand service vehicles that enter the poorly secured airport perimeter every day. There's no way to "body scan" a truck.

"There's no way to "body scan" a truck."

I've seen something similar on a show in the past and found this clip: https://www.youtube.com/watch?v=rPfUSPVH6oQ

Up for debate is how reliable these scanners are.

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