"Trayvon Martin shooting: It's not George Zimmerman crying for help on 911 recording, 2 experts say"
Orlando Sentinel 2012
http://articles.orlandosentinel.com/2012-03-31/news/os-trayvon-martin-george-zimmerman-911-20120331_1_george-zimmerman-owen-forensic-services-llc-trayvon-martin
"Tom Owen, forensic consultant for Owen Forensic Services LLC and chair emeritus for the American Board of Recorded Evidence, used voice identification software to rule out Zimmerman. Another expert contacted by the Sentinel, utilizing different techniques, came to the same conclusion. . . "