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.