The FBI said its budget figures for Sentinel don't include the cost of government personnel, which is factored into the higher numbers.

WSJ: FBI Files Go Digital, After Delays and Cost Overruns

Audio experts Tom Owen and Ed Primeau, who analyzed the 911 recordings for the Orlando Sentinel, said they don't believe it is Zimmerman who is heard yelling in the background of one 911 call.

CNN: STORY HIGHLIGHTS

Owen and another audio expert, Ed Primeau, analyzed the recording for the Sentinel using different techniques, and they said they don't believe it is Zimmerman who is heard yelling in the background of one 911 call.

CNN: STORY HIGHLIGHTS