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April 2nd, 2012
02:10 PM ET

Top forensic audio expert says audio analysis shows it's not likely Zimmerman is screaming for help on 911 tapes

Today, Trayvon Martin's parents will ask the U.S. Justice Department to investigate possible interference in the investigation by the original state's attorney

One big question remains in this case: Who was heard crying for help on a 911 call in the moments before the teenager was shot?

Tom Owen with Owen Forensic Services was hired by the Orlando Sentinel to examine the 911 tapes. He shows Soledad on "Starting Point" that with sensitive audio programs, he's able to show that George Zimmerman's claims that it was him calling for help on the tape don't match with the analysis.

See Owen explain his method here.

Forensic expert on Zimmerman 9-1-1 tape

Demo of analysis in Zimmerman 9-1-1 call

Owen to compare Martin audio to 911 call
Filed under: Trayvon Martin
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