I can answer that. First, that's a good question. That's a problem we had to grapple with, because we start with no corpses. The body is cremated. There are no witnesses because everything happens in a closed place. It's either perpetrators or victims. There's no crime scene. The operating room is cleaned up afterwards. There are no documents except official party documents that are not going to be released to us, so what do we do? How do we look at it?
When we started, we were asked to investigate this. We weren't given any money, any data, or any direction. Our view was we didn't know. We didn't want to come to this conclusion. My preference would have been the opposite, that this wasn't happening. We walked around it. We talked to people who got out of prison and out of China, patients who went into China, doctors. We looked at hospital websites. We looked at anything that came out of China that we could.
Of course, what made it even more difficult was that as we were going through this research, any time we cited something from an official Chinese source, it would disappear. We would archive everything. This is a rolling cover-up. I don't know if David Kilgour likes this example, but I ask myself what we would know about the Holocaust today if the Nazis had won World War II. That's the sort of situation we're faced with. It's a matter of piecing together what evidence we can.
Since we've done that, you'll get denials and rejections from people out of interest, like the Communist Party of China, but nobody who's done the research independently and doesn't have a vested interest in the outcome has contradicted our research, or even questioned it, which is how Ethan Gutmann came about his work, and Kirk Allison, Arne Schwartz, Jay Lavee, and so on.