it's a wast of time, effort, resources and money to have the bp checked a second time if the person verifying it at the first check does their job. if the checker can't find the quad on a bp, then they need another job as it ain't rocket science but it sure is, as i said before, a waste of time, effort, resources and (my hard earned taxpayer) money to have multiple bp checks-doesn't say much for the management and operations at a given airport if they do it this way.
At my airport, once a PAX clears the ticket-checker, he has 7 lanes to choose from! Yes, we direct selectees (SSSS) to the designated lane, but not all of them follow instructions. (For instance, some just make a dash for the shortest line! Can't blame them for that.) Even if we DID have the lane roped off, it would be easy for someone to slip under the ropes to avoid additional screening! Hence the 2nd BP check at the WTMD just makes sense.
