FBI Expert Can't ID Screams on Trayvon 911 Tape Jury hears tape of cops grilling Zimmerman By Evann Gastaldo, Newser Staff Posted Jul 1, 2013 2:17 PM CDT 195 comments Comments George Zimmerman listens to state witness Dr. Hirotaka Nakasone, a senior voice recognition scientist with the FBI, during his trial in Seminole circuit court, in Sanford, Fla., July 1, 2013. (AP Photo/Orlando Sentinel, Joe Burbank, Pool) (Newser) – Good news for George Zimmerman? An FBI audio expert testified today that, on 911 audio from the night Trayvon Martin died, it's impossible to tell whether the screams heard in the background came from Trayvon or Zimmerman. According to Hirotaka Nakasone, there's not enough usable sound to identify the voice or even the age of the person screaming. Pressed by a prosecutor, however, Nakasone said that if someone was very familiar with a voice, he or she might be able to correctly identify it. He took the stand in advance of Trayvon's mother's testimony—she's expected to testify that the voice is Trayvon's, the Los Angeles Times reports. Meanwhile, prosecutors played a tape of the interview police had with Zimmerman just after the murder, reports the New York Post. Some highlights: After Zimmerman lost sight of Trayvon, "He jumped out of the bushes and he said ‘What the f--k is your problem, homie?' And I got my cell phone out to call 911 this time, and I said, 'I don't have a problem.' And he goes, 'No, now you have a problem,' and he punched me in the nose." "I tried to defend myself. He just started punching me in the face, and I started screaming for help. I couldn't see. I couldn’t breathe. He puts his hand on my nose and mouth, and he says, 'You are going to die tonight.'" Zimmerman says that as Trayvon was banging his head into the concrete, "I just pulled out my firearm and shot him." Zimmerman says Trayvon fell back, saying, "Alright, you got it, you got it."