Can TSA check Mobile boarding passes?
So I'm on the first trip in a couple years and slightly behind the times. Ua gave me the option to use my cellphone as a boarding pass which is cool. I've seen guys hold their phones up to the scanner at the gate to get on the plane. But I'm a bit confused how the tsa id checkers handle it. They like to scribble on the boarding pass and they obviously can't scribble on my phone. Do you have to print a copy for their artwork? If so that seems to defeat the purpose of the mobile pass which saves trees. What am I missing?