I'm definitely not convinced he's innocent, but not entirely convinced he's guilty either. And I'm not a cop lol. Don't forget the documentary missed crucial pieces of evidence such as his sweat in the car (which you can't plant) and the calls he made to Theresa the day of the incident using a private number attachment. He's a dopey fella too so maybe leaving the car in his backyard was a genius idea to him haha
I know the show was bias and cut out anything that would have convinced people that he was 100% guilty.
The only thing that makes it suspicious as f*ck is the fact that the police were so hell bent on proving he did it, they were sloppy in everything they did, from finding that key after days of searching the same room and finding it in plain view, to having officers who weren't supposed to even be on the property.
That recording of the officer calling in the number plate and make of the car when the car wasn't even there raises all doubt about the legitimacy of these officers.