There is a simple solution. The TSO's should carry a supply of tiny sample cups like the ones they use at the stores for samples of product. I would not mind pouring a few drops from the drink I am drinking so they could actually dunk the strips. They do not get close to my drink, they get their sample. It's not as theatrical though.
Uh oh.......I just thought of something. If we start getting a lot of false positives, not unheard of with the even the rigorously scientific procedures of the TSA, then we will have a problem.
Better to stick with the knowingly unworkable "wave the strip" method.