This innocent man spent half his life in prison. The cop who interrogated him became a Guantánamo torturer – video

Detective Richard Zuley's police work sent Lathierial Boyd to prison for a murder he didn't commit – based on faulty evidence, after he recalls being chained up. But a Guardian investigation has found that Boyd may not be alone

• Part one: Bad lieutenant – American police brutality, exported from Chicago to Guantánamo

• Part two: How Chicago police condemned the innocent – a trail of coerced confessions