First, my deepest sympathy for your loss of Billy. Nobody, but nobody deserves to go through what you and your son had to go through. What was the final outcome of this outrage? Was the Davie Police ever brought to task for the corruption? I'm assuming you filed a law suit against them.
I too am personally involved in a similar situation and I'm looking for some answers.
Be well and stay strong and just know there are people out there who do care.