George Zimmerman's lawyers want the 911 tape of screaming voices to be played in court. They say the voice belongs to Zimmerman, who is supposedly screaming for help while grappling with Trayvon Martin.
The prosecution says the voice belongs to Martin, moments before he was slain by Zimmerman.
On Thursday, an FBI speech scientist testified in court that technology, even as advanced as it is these days, can't specifically determine whom the screaming actually belongs to. The screaming, Dr. Hirotake Nakasone said, is just too far in the distance to narrow down.
On Friday, Tom Owen, a voice expert hired by the Orlando Sentinel, is testifying that Zimmerman's voice does not match the screaming on the tape.
Owen was hired by the paper last year.
The recording is a key piece of evidence for Zimmerman's murder trial, which is set to kick off Monday.
In the tape, a voice is heard screaming in the distance on a 911 recording. According to Nakasone, there's only about three seconds of a lone screamer without other voices interrupting it. He says that's simply not enough to make a scientific ID on the voice.
Now Judge Debra Nelson must decide if voice experts will be allowed to testify during the trial.
Nelson has already denied the defense's request to allow certain witnesses to testify anonymously. She also ruled that photos found in Martin's phone of him possibly holding a gun and smoking pot cannot be mentioned in the defense's opening statement.
She did, however, say the photos could be introduced later during the trial.
Zimmerman, 29, is charged with second-degree murder in the shooting death of Martin, an unarmed black teenager, inside a gated community in Sanford, Florida, in February 2012
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