False confessions: I did it. I did it. Not really.

The use of confidential informants is one of the most controversial issues confronting Multnomah County prosecutors as DA Rod Underhill takes on a plan to ensure that his office does not pursue convictions that can later be overturned.

Almost one in three people who are convicted of major crimes and later cleared by DNA evidence falsely confessed to the crime.

Saul Kassin realizes that to most of us, that intuitively makes no sense. Why would so many people confess to something they didn't do?