Not necessarily. The police were so focused on OJ, to the point of planting evidence that they weren’t about to look ‘elsewhere’. Even after losing they were so intent on it being him they considered the case closed.
Well you just keep believing that evidence was planted and OJ was innocent - and that all the police officers who planted that evidence to frame an innocent man, you know, because they were all racists, have remained silent all of these years instead of cashing in. Sure.