The defense has argued that the quality of the recording is not sufficient to determine whose screams are being heard in the calls' background. Defense expert Dr. James L. Wayman provided further support for that claim Monday, testifying that the sound samples are not long or clear enough to definitively identify the speaker. Zimmerman has said it's him that is heard screaming.
Wayman's assertion is in opposition to the June 7 testimony of Alan Reich, who said that not only are the screams not George Zimmerman's, but that they are likely almost entirely those of the then-17-year-old Martin. That same day, another audio analyst, Tom Owen, agreed that the voice heard screaming was not Zimmerman.
Owen will get another crack at convincing the court that the technology he used warrants the 911 call's inclusion in the trial when he is recalled Wednesday to testify for the state.
The emergency call was made by a neighbor who heard the altercation between the Martin and Zimmerman.