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SANFORD, Fla. -- As jury selection enters its fifth day, Judge Debra Nelson agreed to the attorneys' request to create a pool of 40 potential jurors.

From there, they will seat a jury of six people with four alternatives in George Zimmerman's second-degree murder trial.

Originally, attorneys were hoping to gather a potential pool of 30.

Nelson also made a major ruling on Thursday in the case. She decided the jurors will be sequestered for the length of the trial.

The ruling means the jury will be kept in isolation during the two to four weeks that it is expected to last.

Nelson cited security reasons for keeping the jurors away from the public eye.

This ruling could make seating a jury an even longer process.

"For a lot of jurors, that makes it difficult for them because they won't be able to be home at night with their family," said WESH 2 legal analyst Alisa Adamson.

Adamson said imposing sequestration could make the jury selection process even longer, but shorten the actual trial.

During the first four days of jury selection, attorneys have asked potential jurors about the hardships they would face if they were kept away from their families during the trial.

On Thursday, Juror E81, a woman in her 40s, was questioned for about an hour after saying she believes Zimmerman is innocent. E81 was the biggest supporter of Zimmerman that has been questioned so far.

State attorney Bernie de la Rionda repeatedly questioned her about whether or not her mind was made up in the case. E81 said it would take clear evidence that proved Zimmerman was guilty to change her mind.

"Unless something is shown to me that erases all doubt in my mind, then my mind is made up," she said.

She said Trayvon Martin was heading down the wrong path and referenced pictures that showed him smoking marijuana.