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News Link • Criminal Justice System

Screams on 911 call not Zimmerman’s, forensic expert says

• Washington Post
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 teenager was shot?

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


1 Comments in Response to

Comment by Joseph Brennan
Entered on:

 I watched this "expert," on CNN.  I have serious concerns about the process he used and the way he drew his conclusions.  For one, he did demonstrations to show how his software wors, where he compared Zimmerman's talkng voice on teh 911 call, to itself.  The softwear returned a match with 99% certainty.  Then he comapred the scream with itself, and got a 99% match.  He didn't present an example where his softwear comaped a scream with a talking sampe from the same person.  How do I know his softwear can correctly make that identification?  Also, lay people tend to be dazzled by technical "experts" and their technology.  Humans wrote this softwear, and it could have any flaws they inadvertantly wrote into it.  Just because the softwear says it, doesn't make it so.  Even when comparing the scream to itself, the softwear was only 99% certain, not 100%.

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