(CBS News) SANFORD, Fla. - Florida Gov. Rick Scott has appointed a new special prosecutor to investigate the Feb. 28 shooting death of teenager Trayvon Martin.
Scott is also forming a task force to look into the state's controversial "Stand Your Ground" law.
There was as a massive rally Thursday night in Sanford, where Martin was killed by neighborhood watch volunteer George Zimmerman.
No city in America has had a week of such intense, negative pressure as Sanford.
Each day an admitted shooter remains free, racial divisions here widen a little more.
Martin was black. Zimmerman's family says he's Hispanic but police have described him as white.
"Enough is enough," Rev. Al Sharpton told the crowd at the rally. "We are tired of going to jail for nothing and others going home for something."
Thousands of people cheered bitterly in Sanford. To them, the Trayvon Martin case represents race and injustice.
"No justice! No peace!" the crowd chanted.
Martin, 17, was unarmed when Zimmerman shot him once in the chest.
Zimmerman claimed self-defense and was never arrested.
National outrage keeps growing, and has forced Sanford Police Chief Bill Lee to take an unpaid leave. "I do this in the hopes of restoring some semblance of calm to the city, which has been in turmoil for several weeks," Lee said.
CBS News has learned detectives interviewed Zimmerman for five hours the night of the shooting, and again the following day at a re-enactment of the incident. A source close to the investigation told us there was no arrest because the evidence, including Zimmerman's bloody and bruised face, seemed to support his claim of self-defense.
A day later, Zimmerman also passed a voice stress test.
"At this point, we need to know everything," says Vincent Champion, president of the Coastal Florida Police Benevolent Association, which represents Sanford police. "Then, let's make the appropriate decisions. If the decisions were made wrong, then somebody needs to answer for those. If the decisions were made right, then that's our system and we have to live with it."
Department of Justice officials, investigating a possible hate crime, met with Martin's parents Thursday.
They believe their son was murdered. But federal investigators warned the family a thorough investigation could take weeks.
Tracy Martin, Trayvon's father, wants what the crowd at the rally called for: an arrest, now. "Trayvon was a people person," Tracy Martin told the crowd. "He didn't deserve to die, and I pledged I would not let my son die in vain."
Federal investigators have yet to interview Zimmerman, and he has yet to hire a lawyer.
Seminole State College has expelled him. Officials there say they did it for his safety, and that of other students.
To see Mark Strassmann's report, click on the video in the player above.