Semon Frank Thompson filled a syringe with water, knowing — if this weren't just a job training — he'd be moments away from killing someone.

"I can remember this feeling," he explains of his time working in an Oregon prison. "Like, this just doesn’t make sense.”

At the time, Thompson believed in the death penalty. As a young black man growing up in the segregated South, he remembered the 1955 lynching of Emmett Till, a black teenager who was murdered at the hands of white supremacists for daring to flirt with a white woman.

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