Originally Posted by HSVTSO Dean

I know it actually works like it's supposed to here in Huntsville; if a passenger is boarding the plane and presents a boarding pass that doesn't have the markings on it, then the gate agent doesn't allow them to board. Instead, they call us at the checkpoint, and we go to the gate to verify that they've been screened.

On the other hand, I've also read some threads here on FT where the gate agent didn't notice/didn't care about the non-presence of the markings on the boarding passes.