Published: September 19, 2014

For many Americans, the storyline that played out on August 9 in Ferguson, Mo. — when an unarmed black teenager was fatally shot by a white police officer — is not a new one. But the sustained protests that followed, in which Ferguson police used military equipment for crowd control, have generated a new round of questioning about the role of local police in their communities.

So on this episode, we’re looking at the history of policing in America, and how the police departments we’re familiar with today began to take shape. And we’ll consider what happens when the police don’t protect those they serve.