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 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 people have died. Oversight is sometimes the only thing ensuring a prison sentence does not become a death sentence. There is one way to pierce the opacity of our prison systems. Contraband cellphones, smuggled in by guards and sold to prisoners on the black market, can capture these deplorable conditions in grainy, devastating detail. The brutality we see in many state prisons is a choice. This summer, on a visit to the Maine state prison, I witnessed men use email, Zoom and other digital tools as part of programs instituted by Randall Liberty, the forward-looking Maine corrections commissioner. When prison leadership has nothing to hide, incarcerated people have access to technology that would make it easy to document abuses.