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More info:

Informative, though I don't think that relates to the TSA.

true, it was more in reference to constitution-free zones.

The TSA does it as well, not having any valid justification has never stopped security theater before.

TFA: A TSA spokesman, Matt Leas, declined to comment on the lawsuit but said: “TSA does not search the contents of electronic devices.”

So my guess is that they aren’t supposed to do this, and if a judge ever got the case, the TSA would be in lots of trouble if found doing it.

I would think that you have the right to refuse to show them, and they have the right to refuse to let you through security.

Flying is not a constitutionally protected activity... see, for example, the legality of un-appealable no-fly lists.