Originally Posted by
GoingAway
Can you expand on the "legit" part? What's the purpose/what was/is he looking for/at?
One of the TSOs who used to be on this forum more explained that there's an authentication feature on some passports on the page where it's sewn and the fastest way for him to verify a passport is to flip to that page. That being said, I can't find such a feature on my passport (though maybe it isn't there since I have a 48-page passport), nor seen a TDC do that with mine.