Owen said on Friday he used Zimmerman's voice from his reenactment video to try to match the screams on the 911 call, raising Zimmerman's voice in the reenactment video and looping the 911 call clip with the screams in order to make a long enough sample to analyze.

French opposed to Owen's methodology, saying it was," not acceptable in the wider scientific community."

Both Owen and Reich testified on Friday at the Frye hearing, as West challenged their methodologies, findings and qualifications as audio experts.

The screams are crucial pieces of evidence since they could determine who the aggressor was in the confrontation.

The defense could also ask Nelson on Saturday to bar prosecutors from using certain words during the trial, believing words such as "profiling," or "vigilante," or even "wannabe cop," to describe Zimmerman would create an emotional response in the jury.

Nelson did rule on Friday that Zimmerman's 6 p.m. curfew could be extended until 10 p.m. at the end of Friday's hearing, but said he is still not allowed to travel out of Seminole County except to his attorney's office. The state had objected to the motion, given prior issues with bond.

[PHOTOS: Zimmerman in courtroom | VIDEO: Friday report from court]

Zimmerman is charged with second-degree murder for fatally shooting 17-year-old Trayvon Martin during a struggle in a gated community where he lived. He is pleading not guilty, claiming self-defense.

Martin's family claim the cries came from the teen while Zimmerman's father has testified they were those of his son.

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