There's an interesting discussion going on the DUB Facebook page about the current pre clearance arrangements, where passengers have to clear security twice about five minutes apart. It has me wondering whether there's any way at all that a direct route to pre clearance could be constructed which would avoid the double check...
So give them no access to the airport after check in?
TSA Security was moved to reduce congestion which has worked reasonably well. Guess people prefer longer queue's then....