If I am understanding this correctly the TSA/Customs officials could submit you to a backscatter/pat-down BEFORE you clear customs and the Constitutional argume

If I am understanding this correctly the TSA/Customs officials could submit you to a backscatter/pat-down BEFORE you clear customs and the Constitutional argument evaporates. I imagine that would require an overhaul of the layout of many airports, but perhaps if enough people make a fuss like the author then someone will push for it. Does anyone know of a reason they couldn't do another security screening after you land and just before you clear customs ?