One important aspect of a scientific theory is to propose refutable propositions. For instance, special relativity could be refuted if someone measured something moving faster than the speed of light (in vacuum). There actually was a buzz a few years ago with neutrino at the CERN, supposedly going faster than c, but it turned out to be an error of the device. Scientists were actually excited to see a theory so strong being refuted; it would have mean a huge leap for knowledge.
I wonder, in FET, what would be considered as a refutation of the theory? What kind of observation or data could prove FET wrong?