Have the police presented any new information? Have they reopened the case with new eyes, starting from the beginning? They should track the officer's phone, along with Mr. Williams's phone, to see where they both ping. There have to be others out there that had run ins with this officer that could at least attest to his racism and unprofessional behavior, and maybe someone else that he drove out into nowhere and left. I think if the police/FBI put a task force together that they could get closer to finding evidence against this horrible human being.