So, in short, how much evidence is there for UFOs—hard evidence of alien abduction?
KLASS: There simply is no scientifically credible evidence that we have alien visitors. If there were, there would no longer be a mystery; there would no longer be a controversy. ….So even if the idea of extraterrestrial visitors is a bit far out, we’ve had more than 50 years to come up with artifacts, with evidence. And nobody has been able to come up with it. And in fact, Betty and Barney Hill, in 1961, who claimed they’d been aboard a flying saucer—or they made the claim in 1966. If they had brought back a quartz watch, wristwatch, in mid ’66—could not have made this on this earth—and we would have looked at that and would have said: My goodness, that proves their story is true, they were on board an extraterrestrial craft. That single artifact. ‘Cause a quartz watch could not have been made on this earth at any price in 1966. But in all of 50 years, nearly 50 years since UFOs were first reported or discovered or invented, nobody has come up with any credible evidence.
