I mean the film depicted him as the probable culprit, but that doesn't mean it's accurate. Remember Zodiac, where it also focused on a suspect, but he was most likely not the real Zodiac.
Anyway it was a good film, and knowing how police work it's not surprising they made no arrest and it took over a year to search the marsh. The film also points to them as part of a coverup. We know for a fact police often frame the innocent and ignore the guilty for many reasons. I think we need a whole new police system that works for the people, not just exist for the self-benefit of the police.
My question is why didn't Mari get her friends to do the search in the marsh? She seems to have done so much more in the investigation. Another aspect it touches on, but doesn't go into is Shannon was put on psychiatric drugs. That is probably what caused he mental problems, not vice versa. And then we find out at the end that her other daughter Sarra was also put on these drugs and suffered withdrawal and killed Mari. I.e,. psychiatry is culpable as it often is, but of course they have plausible deniability. Someday people will realize how evil the psychiatric establishment is and that they do so much more harm than good.
It is NOT the psychiatric establishment that is to blame. It is the big pharma dictating medical protocol with the help of the insurance business, trying to convince everyone that magic pills will cure everything instead of well established, hands on medical procedure.
Big Pharma and psychiatry have become one in the same.