Key Rulings in Tuesday's Zimmerman Hearing

Trayvon's alleged drug use is barred from trial.

Experts Disagree on 911 Recordings - In two different reports, audio experts (both hired by Zimmerman's defense) had conflicting opinions over whether it was Trayvon's screams or Zimmerman's heard in 911 recordings from the night of shooting. One expert from a New Jersey-based company said the screams came from Trayvon. Another expert, based in Florida, said that the audio was combination of sounds from both the teenager and Zimmerman. (Photos from left: Sanford District Court, Joe Burbank - Pool/Getty Images)

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Latest Developments - On Tuesday, Circuit Judge Debra Nelson made several key rulings pertinent to George Zimmerman's second-degree murder trial in the shooting death of Trayvon Martin, set to begin June 10. Keep reading for a look at the day's biggest developments. — Britt Middleton (Photos from left: Sanford District Court, Joe Burbank - Pool/Getty Images)

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Use of Trayvon's Past Ruled Out…for Now - Nelson said that Zimmerman's defense won't be allowed to use Trayvon's alleged drug use, school suspensions or past fighting during opening statements at trial. However, she said the defense could possibly reintroduce this information at a later date if proven relevant during trial. (Photo:  Joe Burbank-Pool/Getty Images)

Trayvon's Personal Texts, Photos Ruled Out - The judge also ruled that Zimmerman's defense cannot use text messages taken from Trayvon's cell phone, mention fights the teen was involved in prior to his confrontation with Zimmerman, or Trayvon's alleged drug use during opening statements of the trial. However, some of that information could be introduced at a later date if proven relevant, the judge said. Zimmerman's defense previously argued that the 17-year-old was high on marijuana the night he was killed. (Photo: Sanford District Court)

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Trayvon Texts and Social Media Accounts - Some of Trayvon's text messages and social media references will also be barred from opening statements during trial. However, the judge says they may be introduced later if proven pertinent. (Photo: Sanford District Court)

Jury Won't Be Sequestered - The pool of 500 jurors will not be sequestered during jury selection, Nelson ruled on May 28. Nelson also struck down a motion allowing jurors to visit the shooting scene during trial. (Photo: Joe Burbank-Pool/Getty Images)

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No Delay in Trial - Judge Nelson also denied a request to delay the trial date, scheduled for June 10. Zimmerman's attorney, Mark O'Mara, said of the ruling the defense would "have a lot more work to do than we can get accomplished between now and June 10," according to the Associated Press. Zimmerman was not present at Tuesday's hearing. (Photo: Joe Burbank-Pool/Getty Images)

Jury Won't Be Sequestered - A pool of 500 perspective jurors will not be sequestered during jury selection, Nelson ruled. She said jurors will only be referred to by their jury numbers and photography of their faces will be prohibited. Nelson also struck down a motion allowing jurors to visit the shooting scene during trial. (Photo: Joe Burbank-Pool/Getty Images)

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Jury Won't Be Sequestered - A pool of 500 perspective jurors will not be sequestered during jury selection, Nelson ruled. She said jurors will only be referred to by their jury numbers and photography of their faces will be prohibited. Nelson also struck down a motion allowing jurors to visit the shooting scene during trial. (Photo: Joe Burbank-Pool/Getty Images)

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Second Witness List Released - On April 18, Zimmerman's defense team released its second witness list. The six-page document listed dozens of names from the Sanford Police Department, investigators from Florida Department of Law Enforcement and the State Attorney's Office, officials with the Medical Examiner's office, and civilians, among others. (Photo: Joe Burbank-Pool/Getty/Images)

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No Gag Order for Attorneys - The judge denied a request from prosecutors for a gag order prohibiting attorneys from discussing the case publicly. (Photo: Joe Burbank-Pool/Getty/Images)

Trayvon's Parents Respond - Trayvon's parents, Tracy Martin and Sybrina Fulton, were present at the May 28 hearing. Of the judge's rulings, Martin family attorney Benjamin Crump said they were pleased with the outcome. "Trayvon Martin is not on trial," he said. (Photo:  Joe Burbank - Pool/Getty Images)

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Trayvon's Parents Respond - Trayvon's parents, Tracy Martin and Sybrina Fulton, were present at the May 28 hearing. Of the judge's rulings, Martin family attorney Benjamin Crump said they were pleased with the outcome. "Trayvon Martin is not on trial," he said. (Photo:  Joe Burbank - Pool/Getty Images)