Cellphone video shows an inmate hanging out of the back window of a state prison transport van moving at freeway speeds in Oklahoma City last week. The Sept. 2 incident was recorded by Tiggin Martin, who said she spotted other video of the incident on social media. The incident took place on Interstate 40, a nearly coast-to-coast highway that runs through the heart of Oklahoma City, Martin's video, verified by NBC News, shows. In the video, the inmate, partially covered by an o

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