Shon Barnes is the police chief in Madison, Wisconsin. A new documentary (the 54th mile policing project) follows Chief Barnes and two other black police officers as they undertake a historic civil rights march from Selma to Montgomery Alabama. Jerry Ratcliffe chats with Dr. Barnes about his embracing of education and evidence-based policing, the challenges of working with communities in the post-George Floyd world, and the lessons he took away from his three-day trek across Alabama.