I am not sure if they can tell who paid full fare, who did Y/B up's and who is using an upgrade instrument

I have noticed the GA's seem to be doing a much better job IMO over the last 30-45 days. They seem to be following the announcement protocol and I have even witnessed them "enforcing" it at the scanners. I was boarding a 757 at ORD as a 1k and the GA turned 2 pax around that were in front of me because they we not GS/1K or confirmed F.. Then about 2 days later on another route after the announcements and the usual bum rush the GA came back onto the intercom and stated "there are only 21 GS/1K pax on this flight the rest of you please stand back so we don't delay the boarding process"..When I got to the scanner I told her thank you and she smiled and said she has wanted to that for a long time...