Re scanning on exit.
Picture the scene a T20 game, could go either way, into the last over of the match.
It's gone 10pm, spectators hover by the exits waiting for the last ball, and then whoosh a mass stampede to get out, no one will wait to get scanned out.
You don't get scanned out at Football, you don't get scanned out in the theatre, I don't see the point.