Ultimately this is a win-win for TSA in that we are going to be screening a subset of passengers at another location, thereby removing those individuals from a checkpoint line at a larger airport.
Not including metal detectors and pre-computer screenings, 12 to 15 percent of passengers are pulled aside for random security checks, ... If there is a strange or unusual contour on someone's clothing that needs scrutinizing, we will pull them aside.
The lesson learned here is that passengers need to pay close attention during the screening process.