Why would anyone confess to a crime they did not commit? It happens so often in Chicago, defense attorneys call the city the false confession capital of the United States. Chicago has twice as many documented false confession cases as any city in the country. One reason may be the way police go about questioning suspects. And 60 Minutes has learned the Chicago Police Department is now the subject of a Justice Department investigation into its interrogation practices.

Two cases we examined involve several teenage boys who were arrested and they say forced or tricked into confessing to violent crimes they never committed. Each spent nearly half their lives in prison. They are free now, and told us their story together for the first time.

Terrill Swift: We all of us got one thing in common. We did an extensive amount of time in jail for something we didn't do. And that's the bottom line.

They each would serve sentences that ranged from 15 years to life. Terrill Swift, Michael Saunders, Vincent Thames, and Harold Richardson were convicted in one rape and murder. James Harden, Robert Taylor and Jonathan Barr, in a different one. All were found guilty based solely on confessions.

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