The Last Word with Lawrence O'Donnell 04/02/12

Audio experts: Screaming not Zimmerman’s

Audio forensic experts Ed Primeau and Tom Owen analyze the Trayon Martin 911 tape on The Last Word. Both concluded the voice screaming for help in the background is not George Zimmerman. Plus, Charles Blow weighs in on the case's latest developments. ... more Duration: {{video.duration.momentjs}}