I made the following post earlier today at DZ. I'm reposting it here because I think it fits the topic currently being discussed:
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I just finished watching a documentary on Authur Leigh Allen, who was the primary suspect in the Zodiac Killer case. Although the show was about a Zodiac suspect, there was a quote at the end that certainly applies to the DB Cooper case and the "suspects" in that case including, but certainly not limited to, one Kenneth Christiansen. The quote comes from Dr. Kim Rossmo, who is Research Professor, Department of Criminal Justice at Texas State University.
Dr. Rossmo says the following:
"It's very important, and I think that this is something that has been forgotten about in the Zodiac case, It's very important to let the evidence drive the suspects, not let the suspects drive the evidence. What I mean by that is we evaluate our suspects by our known reliable physical evidence. We don't look at a good suspect that we think we have a personal interest in or a particular theory that we favor and then start to re-interpret the physical evidence. That's not how you do a case, that's gotten a lot of people into trouble in the whole Jack The Ripper case, one of the most famous unsolved serial murder investigations and we tend to see now books with various titles full about how they've solved the case, etc. But the actual fact is they tend to be more text books of how not to do a criminal investigation. It's important for any analyst or investigator, profiler or detective or anyone who is seeking to determine the truth, and let's throw in judges and scientists here too, is to come as unbiased as possible, look through all the facts and the data, and make the best determination at the end of the day. But if we've made our determination before hand, the psychological research is very clear, try as we might, we become locked into circular patterns of thinking and we keep returning to what we want to think rather than what the evidence suggests that we should think.
So, if we're going to evaluate someone like Author Leigh Allen, we have to consider all of the ways he doesn't match the profile of the Zodiac".
I also found another quote recently (again from the Zodiac case) that I think applies. This was a second hand quote attributed to a Lt Bruton of SFPD talking about Zidiac suspects and circumstantial evidence in October 1999:
"You could open a page of the telephone book at random, throw a dart, investigate the person it lands on, and build up a good case against him".