Tom Maguire and Jeralyn Merritt — via Instapundit — delve into the science of "voice biometrics," after an expert in this field, Tom Owen, asserted "with reasonable scientific certainty" that the screaming voice on the 911 recording was not that of George Zimmerman.
Please read the analysis by Merritt and Maguire. I just want to say one thing. Those who are pushing for the prosecution and conviction of Zimmerman, who seize with glee upon the voice biometrician's packaged conclusion, need to think about the use of this kind of expert opinion in all the other cases where prosecutors have more than one random recording of a person's voice. Your enthusiasm level should be the same. How reliable is this kind of expert opinion?
Obviously, if Zimmerman were at trial and Owen testified, giving his expert opinion, he would be cross-examined. His own statements — for example, claiming "reasonable scientific certainty" when he only had 2 recordings with different words and where one is screaming and one is not — would be used to impeach his credibility. Before you go too far, relying on the Expert! and Science!, go back to Merritt and Maguire and read carefully, imagining yourself as Zimmerman's defense lawyer and preparing your cross-examination.
In fact, you should imagine yourself as the prosecutor, imagining how the prosecution witness Owen would be cross-examined by Zimmerman's defense lawyer and deciding whether you would want to use Owen as a witness at all. And now — since I'm the lawprof giving assignments this morning — answer the following multiple choice question:
Explain/qualify your answer in the comments.