What Constitutes Proof in Ufology?

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What Constitutes Proof in Ufology?

What constitutes proof in Ufology? Like everyone else, I'm looking for the answer or answers - but would I know if I saw them? (Another personal view from the author of "UFOs Before Roswell" and "Dawn of the Flying Saucers.)
https://www.youtube.com/watch?v=hZk1TRsG5ic