ONTD Political

It's not George Zimmerman crying for help on 911 recording, 2 experts say

5:41 pm - 03/31/2012


As the Trayvon Martin controversy splinters into a debate about self-defense, a central question remains: Who was heard crying for help on a 911 call in the moments before the teen was shot?

A leading expert in the field of forensic voice identification sought to answer that question by analyzing the recordings for the Orlando Sentinel.

His result: It was not George Zimmerman who called for help.


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.

Zimmerman claims self-defense in the shooting and told police he was the one screaming for help. But these experts say the evidence tells a different story.



'Scientific certainty'

On a rainy night in late February, a woman called 911 to report someone crying out for help in her gated Sanford community, Retreat at Twin Lakes.

Though several of her neighbors eventually called authorities, she phoned early enough for dispatchers to hear the panicked cries and the gunshot that took Trayvon Martin's life.

George Zimmerman, a Neighborhood Watch volunteer, shot Trayvon, an unarmed 17-year-old, during a one-on-one confrontation Feb. 26.

Before the shot, one of them can be heard screaming for help.

Owen, a court-qualified expert witness and former chief engineer for the New York Public Library's Rodgers and Hammerstein Archives of Recorded Sound, is an authority on biometric voice analysis — a computerized process comparing attributes of voices to determine whether they match.

After the Sentinel contacted Owen, he used software called Easy Voice Biometrics to compare Zimmerman's voice to the 911 call screams.

"I took all of the screams and put those together, and cut out everything else," Owen says.

The software compared that audio to Zimmerman's voice. It returned a 48 percent match. Owen said to reach a positive match with audio of this quality, he'd expect higher than 90 percent.

"As a result of that, you can say with reasonable scientific certainty that it's not Zimmerman," Owen says, stressing that he cannot confirm the voice as Trayvon's, because he didn't have a sample of the teen's voice to compare.

Forensic voice identification is not a new or novel concept; in fact, a recent U.S. Department of Justice committee report notes that federal interest in the technology "has a history of nearly 70 years."

In the post 9-11 world, Owen says, voice identification is "the main biometric tool" used to track international criminals, as well as terrorists.

"These people don't leave fingerprints, but they do still need to talk to one another," he says.

'The home run'

Though the term "biometric analysis" may sound futuristic, it basically just means using personal characteristics for identification. A fingerprint scanner is an example of a biometric device.

Much as the ridges of a human hand produce a fingerprint, each human voice has unique, distinguishable traits, Owen says. "They're all particular to the individual."

The technology Owen used to analyze the Zimmerman tape has a wide range of applications, including national security and international policing, he said. A recently as January, Owen used the same technology to identify accused murderer Sheila Davalloo in a 911 call made almost a decade ago.

Owen testified that it was Davalloo, accused of stabbing another woman nine times in a condo in Shippan, Conn., who reported the killing to police from a pay phone in November 2002.

Davalloo was convicted, according to news reports.

Owen says the audio from Zimmerman's call is much better quality than the 911 call in the Davalloo case. Voice identification experts judge the quality based on a signal-to-noise ratio; in other words, comparing the usable audio in a clip to the environmental noises that make a match difficult.

And the call on which the screams are heard is better quality than is necessary, Owen says.

"In our world, that's the home run," he says.

Not all experts rely on biometrics. Ed Primeau, a Michigan-based audio engineer and forensics expert, is not a believer in the technology's use in courtroom settings.

He relies instead on audio enhancement and human analysis based on forensic experience. After listening closely to the 911 tape on which the screams are heard, Primeau also has a strong opinion.

"I believe that's Trayvon Martin in the background, without a doubt," Primeau says, stressing that the tone of the voice is a giveaway. "That's a young man screaming."

Zimmerman's call to authorities minutes before the shooting provides a good standard for comparison, Primeau says, because it captures his voice both at rest and in an agitated state.

'CSI' effect

Only one person alive knows exactly what transpired in the moments immediately before Trayvon was fatally shot: Zimmerman, who has claimed he fired in self-defense.
source

astragali 1st-Apr-2012 04:03 pm (UTC)
and until the police have a warrant they'd tell him to go home. the police are the ones who make this happen, not the defendant.
chaya 2nd-Apr-2012 03:03 pm (UTC)
Unless you turn yourself in and confess.
astragali 2nd-Apr-2012 03:07 pm (UTC)
you don't get how this works, do you?

what's he going to confess to? he already said he shot trayvon. that isn't in dispute.
chaya 2nd-Apr-2012 03:10 pm (UTC)
He coullllddddd, confess to lying about the self-defense claim? About how it wasn't him screaming for help, there was no confrontation on Trayvon's part, no threatening statements made by Trayvon, no one-hit punch that dropped him to the ground, no beating that made him fear for his life, etc etc? He could admit that he lied?
astragali 2nd-Apr-2012 03:13 pm (UTC)
the problem with this case isn't that zimmerman isn't forthcoming, and that's not what will fix it. what will fix it is when the police stop being racist assbags and choose to treat this as the crime which it is.
chaya 2nd-Apr-2012 03:15 pm (UTC)
So you admit that there doesn't need to be a warrant for him to turn himself for murdering Trayvon in cold blood.
astragali 2nd-Apr-2012 03:20 pm (UTC)
no and i'm p. surprised by how little you seem to know about the criminal justice system. without a warrant, he can't be held. even if he came in and confessed to something he'd already acknowledged doing that still doesn't give them a reason to hold him. there has to be a warrant--probable cause to detain him for a crime. the problem is that the police don't see this as a crime.
chaya 2nd-Apr-2012 03:23 pm (UTC)
So when people are arrested at the scene of the crime, there's a warrant somewhere? Or is that an exception? Can anyone roll into a police station and admit they've committed a crime and then roll out again? I'm genuinely curious.
astragali 2nd-Apr-2012 03:37 pm (UTC)
if i'm arrested leaving a bank with a gun, a sack of money and a note that says "give me all your money," then there's probable cause to believe i committed a crime and should be held. it's reasonable to believe i'll be charged. but when zimmerman says "i shot him but then i feared for my life," then the law says you cannot arrest someone if they acted in self-defense (or had a reasonable belief they were in danger). he cannot be arrested until a district attorney/special prosecutor says "nope, sorry, there's enough evidence that he wasn't acting in self-defense to believe a crime occurred." the self-defense statement can't be set aside by anyone but a DA. it doesn't matter if he comes in and says he's a racist shit and hates black boys and is glad trayvon is dead until a DA says there's a warrant.

that's why that law is so bad.
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