The reason they couldn't fly into Mordor

found on Reddit

They will take your prescious things, if you're not careful.

One badge to rule them all

found on Piximus

As if they were only interested in your pockets. A TSA screener in an airport seems to have (or at least seems to think they have) all the authority in the world to do and check whatever they like, and they definitely will not stop at just your pockets.