https://www.mercurynews.com/filmmakers- ... iller-case
“Part of the reason why the Zodiac case was not solved was due to a lead detective’s obsession,” Davidson said. “I can’t reveal too much more because, actually, there’s an element in the Zodiac case that’s really not been talked about before that we uncovered and got people to talk about how that explains why it wasn’t solved in the 1970s.”
Davidson went went on to say that there existed a “culture within the (San Francisco) police department that you don’t talk, you don’t rat out your fellow officers. I wouldn’t go as far to say that there was a cover up, per se, but there is certainly information that these former detectives were not talking about that I ultimately did get them to talk about.”
