There have been near-daily protests in St. Louis following the September 2017 acquittal of a white police officer who killed a black man six years ago. And mounting allegations of excessive use of force by police officers responding to those protests. As all this pressure from the outside builds, we’re coming at the issue of police accountability from a different angle. We bring you the stories of black cops, past and present, who’ve been trying to change the system from the inside.