After another day of potential juror interviews in the George Zimmerman trial, a voice expert testifying for the defense says samples of screams from a 911 call made the night Trayvon Martin was shot and killed are not sufficient enough to analyze for a possible match.

The defense questioned Dr. James L. Wayman, a California-based voice expert testifying via Skype, in an effort to get testimony from the state's own voice experts dismissed from the trial.

Follow LIVE UPDATES online from Day 6 of jury selection.

Voice analysts hired by the state say they believe it was Trayvon Martin, the unarmed 17-year-old, who was screaming in the background of the 911 calls. The defense's experts, including Wayman, say such a conclusion could not be reached based on current analysis software and the poor quality of the 911 call.

"Going through this data and hearing the screams, we've got much less at each segment than a second's worth of data," Wayman explained. "We have far fewer than the 30 points of data that's simply not data, by anybody's estimation, to do any reliable guestimate of who the speaker was, even if we can narrow the speaker down to two potential speakers."

Wayman also debunked the methodology of one of the state's experts, Tom Owen, who said he looped a sample of the scream in order to create a long enough clip for the software to process.

Wayman compared that tactic with saying he was going to give out four digits from his bank card's PIN, and then saying "The first digit is 1," four times in a row.

During cross-examination by Assistant State Attorney Richard Mantei, Wayman said it was his first time testifying in a United States criminal trial.

The prosecution plans to call back expert Tom Owen on Wednesday at 4 p.m. when the Frye hearing will continue.

The Frye hearing on 911 call analysis resumed after Judge Debra Nelson ruled Monday that jurors' names would remain anonymous after the trial ends. She did not specify how long the names would be sealed.

Lawyers on both sides spent most of Monday interviewing eight new potential jurors. Four of them were retained, increasing the pool to 32 for the next round of traditional voir dire questioning. Lawyers want to fill the pool to 40 before moving on to round two.

Judge Nelson also dismissed 12 yet-to-be-interviewed jurors until Tuesday morning, and six more until Wednesday.

Potential jurors' views on race were the focus of much of Monday's questioning. A defense attorney questioned a potential juror extensively about her views on the case and whether she was bothered by protests led by civil rights leaders after the shooting last year.

A 44-day delay in Zimmerman's arrest led to protests around the nation. Protesters questioned whether the Sanford Police Department was investigating the case seriously because Martin was a black teen from the Miami area.

The third juror questioned Monday morning was a middle-aged white woman who described the protests as unsettling and speculated that there could be further marches in Sanford if Zimmerman isn't convicted of second-degree murder. The jury candidate, who said she has a biracial grandson, also said she was unsure whether Zimmerman racially profiled Martin because it was dark and the Miami teen was wearing a hoodie, possibly making it difficult to see his race.

Zimmerman, a neighborhood watch volunteer, was walking through the community of townhouses where he lived when he spotted Martin walking back from a convenience store to a home belonging to his father's fiancee. Zimmerman called a nonemergency police number, followed Martin and at some point there was a fight between them that left Martin dead. Zimmerman is pleading not guilty, claiming self-defense.

When asked if she thought it was wrong when Zimmerman ignored a police dispatcher's advice not to follow Martin, she answered "yes."

Prosecutors and defense attorneys are seeking a pool of 40 potential jurors who have been screened for any influence of pretrial publicity before moving to a second round of questioning. By Monday, they had interviewed 49 potential jurors over the past week. They must narrow down the pool to six jurors and four alternates.

The judge presiding over the trial Monday asked four more potential jurors back for further questioning, raising to 32 the number of candidates asked to return. Of those asked to return, more than two-thirds are white. The pool also is overwhelmingly female and skews middle-aged.

Those who are picked for the jury will have their names kept private for at least some time after the trial, Judge Debra Nelson ruled Monday. The judge granted a defense motion to keep information on the jurors confidential after the trial, but she said she would wait to decide for how long.

Also interviewed Monday were an older white man who said he didn't have an opinion the case and a middle-aged black man who was dismissed after he said he would have trouble passing judgment on someone because of his religion. Attorneys also questioned a Hispanic mechanic in his 30s who said serving on a jury would be a hardship and a middle-aged white man who said he had donated $20 to Zimmerman's online legal defense fund.

It was the first encounter for attorneys with a potential juror who had donated to the fund. "It just seemed like he was underdog," the potential juror said of Zimmerman. "He couldn't go to work. He had to go into hiding. I just felt sorry for him."

The candidate wasn't asked back.

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Court: Returning juror didn't taint pool

Seminole County court officials said they do not believe the jury pool for the George Zimmerman trial is tainted after a dismissed juror returned to the courthouse Friday and entered the jury room.

A court administrator said there was no contact between the dismissed juror, identified in an incident report as Jerry P. Counelis, and any other jurors.

"We do not believe any of the potential jurors were even aware of the activity going on," said Court Services Administrator Michelle Kennedy.

Counelis, 56, was dismissed last Wednesday after he confirmed to Judge Debra Nelson that he posted a comment on Facebook about the Trayvon Martin shooting in March 2012. The comment bashed the Sanford Police Department for not arresting George Zimmerman.

After being dismissed, Counelis was seen going back into the courthouse on Friday, expressing concern about losing his privacy and complaining about the jury process outside the jury assembly room. He pointed to the jury assembly room and said, "Do they know what they're in for?" He was escorted off the property and given a trespass warning.

Counelis told us in a telephone interview Friday that he went back to the courthouse because it was his "moral civic duty" to shut down information coming out of court about jurors. He refused an on-camera interview, saying he feels the news media is putting up too much information about jurors.