Originally Posted by
Westcoaster
...I wish they'd do what I've read they do at some other airports: Position someone at the entry to the precheck line and have them check whether you get the 3 beeps. Then, and only then, would they allow you to enter the precheck line...
I'm happy to report that the new precheck lane at SEA's central checkpoint has this setup. They scanned my BP at the entrance to the line to make sure that I got the triple beep before letting me enter the line. A big improvement.