Good thing for me I wasn't arguing that the TSA was actually testing the liquids and thus not wasting everyone's time!

Edit: on the other hand, I'm not sure it's so infeasible... If 5% of passengers have liquids, and 5% of those get checked, that still seems like a smaller fraction of people than those that get extra security already. Simply having agents open the bottles and smell them (this actually happened to me in china!) would be somewhat effective...