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Cashill insists that his research process is a cautious one. He says he vets the experts he finds on the Internet.
"When I was working on the TWA book, I met a mechanic who told me he had absolute evidence. And he completely believed it. So while he was telling me about it I thought, 'Well, maybe this is something.' Then it turned out he was absolutely wrong about everything and couldn't back up his statements. So, of course, I didn't pursue that line.
"The most dangerous people are the ones who are sincere and are truly convinced of what they're saying."