In prison, Brian Nelson lived in solitary confinement. That meant 23 hours a day in a small cell. No human contact, except with guards — for 12 years straight.
Then, his prison sentence for murder was over. One moment he was locked down. The next, he was free.
NPR and The Marshall Project, an online journalism group that focuses on the criminal justice system, investigated the release of tens of thousands of prisoners from solitary confinement to find out how many prisoners, like Nelson, go straight from solitary to the streets.