Although this is a government operation and shortcuts probably happen a lot more than we'd suspect. I would find it tough to believe they would use a system so fraught with the ability to forge. I (very much want to) believe the scanners are tied in with WiFi or Bluetooth to do a live lookup.
Taking the anecdotal experiences posted where some BPs pass and some don't, with people using Pre-Check lanes for other airlines, with certain itn's working and some not. That just sounds like a bit much to pull off with some offline system.
Again, my guess. I doubt anyone will be able/willing to divulge the truth, but then this is FT, so the truth isn't a requirement.
