Originally Posted by buckminsterfullerene

You could hand it open to them but you have to hand it to them they use a
UV light to see that the passport is real.

I have never been asked about the lack of entry stamps on mine, those seem to be rare occurences but I will not lie I do worry before every flight and it ends up being the same every time say high they check the passport sign the ticket and send you to the scanner.

Flown out of MIA, FLL, ORD, MDW, and an airport in wisconsin whose name
I do not recall. The abbreviations are for airports in Miami and Chicago.