You asked a question about a hypothetical, but I don't know why a relationship with police should necessarily inhibit good representation. That said, it's not

You asked a question about a hypothetical, but I don't know why a relationship with police should necessarily inhibit good representation. That said, it's not like the defense/prosecutor caseload would be the only thing to change if this hypo came to be. It wouldn't happen in a vacuum, no "suppose everything was the same tomorrow except everybody's calendar got mixed up!"