Audio experts Tom Owen and Ed Primeau, who analyzed the recordings for the Sentinel using different techniques, said they don't believe it is Zimmerman who is heard yelling in the background of one 911 call. They compared those screams with Zimmerman's voice, as recorded in a 911 call he made minutes earlier describing a "suspicious" black male, who ended up being Martin.
"There's a huge chance that this is not Zimmerman's voice," said Primeau, a longtime audio engineer who is listed as an expert in recorded evidence by the American College of Forensic Examiners International. "After 28 years of doing this, I would put my reputation on the line and say this is not George Zimmerman screaming."