When a camera records an act of lethal violence against someone in official custody, the state cannot hide what it typically keeps in the dark. That’s what happened when correction officers murdered Robert Brooks at Marcy correctional facility in New York. Restrained in handcuffs, Brooks was beaten to death by officers unaware that their own body-worn cameras were documenting every blow.

The deaths of Brooks and another handcuffed man, Messiah Nantwi, were the catalysts of a recent investigation by the New York Times that found guards in New York prisons use violence at alarming rates. Because the public is largely unaware of what their tax dollars fund behind prison walls, these revelations are significant. But the violence is not unique to New York.

The states that lock up the most people – Louisiana, Mississippi, Missouri, Oklahoma, Arkansas, Alabama – are the places where watchdogs keep uncovering horrific conditions, from medical neglect that has killed at least 50 people, to jail systems like Mississippi’s where authorities literally cannot say how many........

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