The ziplock bag has magical properties - that's why the screeners require even one item to be in the bag. Once placed in the bag and run through the x-ray machine, the dangerous and volatile explosive chemicals they think are there in place of your tartar control Crest will be magically rendered inert.

The TSA's own scientists developed this theory on the heels of their claim that rogue, poorly educated terrorists can turn an aircraft lavatory into a multi-million dollar controlled environment for chemical processing and handling.