Here's your answer. This has been discussed ad infinitum on prior threads as you well know:
From Dr. Phil Interview of P.I. Paul Ciolino:
Paul says that he spoke with neighbors as part of his investigation. He explains that neighbors on both sides of the home describe hearing screams and a woman calling for help on the night of Rebecca’s death. “We have two independent people, who didn’t converse prior to this, who went to authorities and told them what they heard, and it was discounted. These were clues that weren’t followed up on — or ignored.”
“Why would they not follow up on these [leads]?” Dr. Phil asks Paul.
Paul says, “We have a problem with law enforcement in cases like this, and it’s called, ‘confirmation bias.’ What happens is they take facts that make this look like a suicide, and they take the facts that make it look like a homicide, and they ignore them. They are very reluctant to admit they made a mistake.
“If the sheriff wants to do what’s right, he will open this case up again,” Paul continues. “The victimology in this case stinks. None of this makes sense.”