OJ was super guilty...
Its just that the crime scene was ruined by shitty police work. We learn it now and teach it to new students who learn any forensics as a way of telling people not what to do.
*His blood found all over the crime scene while he was still in Chicago, where he had fled the night of the murder, so it could NOT have been "planted", because police did not yet have a sample of his blood.
The problem was police "lost" his blood for a while.
*His blood drops also found in a trail on the left side of the bloody footprints leading away from the scene (he was found the day after the murders to have had a bleeding knife wound on his left hand).
Which filled up a glove, which the police LOST and replaced with one that did not fit. The police basically ruined this one again.
*His and the victims' blood in the footprints on the floor of his car, all over the car seats, and in a trail leading up his driveway, into his bedroom, and on articles of his clothing.
The problem here was that the police did not cordon the area properly. There were pictures of journalists touching the crime scene/police men sitting in his car (for lolz).
*Carpet fibers from his car in Nicole's throat wound.
Again the problem was that they portrayed the cops as incompetent. This was real evidence (to be fair so was the rest but the police were so hellbent on putting him in jail they contaminated evidence willingly IMHO when it was a simple cut and shut case)
*Photos of him wearing the rare and expensive shoes that left the crime scene footprints, which also happened to be his size. If I recall, only around 300 pairs of those shoes were ever produced, worldwide; even fewer in his size, 12.
This was sadly a plant. Again, bent cops rather than sensible people. Its the whole how do you cross a blood soaked floor.
On your tip toes, the footprints here were flat rather than how someone would normally walk. Unless he was so used to blood...
Basically HE WAS GUILTY. There is mindboggling amounts of evidence without having to fake more. The cops did not do their job properly. OJ is "guilty" but not based on what evidence the cops "produced" since some of it was bad.