Originally Posted by
canyonleo
Oh no, that will mean non-Pre check fliers won't be able to use the Pre check line just to cut the regular line! I'm not Pre on some other airlines (yes, as there was no GE office where I live, until recently).
I believe that the checkers can tell if one is even eligible for Pre-Check on a given airline as well as if they qualify for this particular flight. For people who are not even eligible in a given case, and try to scam it, the best approach would be to send them out of the line. For those that are eligible, but don't qualify on a given flight (no general way to know without scanning barcodes), jumping into the line is reasonable.
Cheers.