The report has outraged African-American leaders throughout the United States who say they suspect Bay County officials of a racist cover-up and accuse boot camp officers of murder.
In a letter to the U.S. Justice Department's Office of Civil Rights - which announced Thursday it was commencing an investigation into Martin's death - the Southern Christian Leadership Conference asked federal authorities to look into whether any youths were safe at Florida's military-style youth lockups.
"It is imperative that the federal government assure the citizens of Florida that our correctional institutions are not places that are high-risk and life-threatening, " wrote Sevell C. Brown, the group's state president.
Florida's black state lawmakers sent a letter to Gov. Jeb Bush on Friday calling for the arrest of the guards, the appointment of a special prosecutor and a new coroner to perform an autopsy.
The letter, signed by Sens. Tony Hill, of Jacksonville, Gary Siplin of Orlando, and Frederica Wilson of Miami, all Democrats, also questions why Martin's body was allowed to be transferred from Pensacola - where he died in a hospital - back to Panama City for the autopsy.
Bush said such calls are premature. "I don't believe we should shut down every boot camp because there's this one tragic incident, " he said.
A basketball player and one-time honor roll student, Martin was sentenced to the boot camp after he violated probation on a grand theft charge: He went joyriding with relatives in his grandmother's car during a church service and wrecked the car.
MOMENT BY MOMENT
The video, taken by a camp security camera, opens with Martin pushed up against a pole or tree trunk, five uniformed drill instructors surrounding him. One of the officers seems to be pressing much of his body weight against the motionless youth.
Suddenly, one officer thrusts his knee into the back of Martin's legs, and the teen collapses to the ground. One officer has his arm in a wristlock; another appears to have his hand around his throat.
At one point, an officer loses his wide-brimmed field hat, and another carefully replaces it on his head.
The restraint on the ground lasts about 90 seconds. The officers try to lift Martin off the ground, but he falls to his knees. Moments later, Martin is placed on the ground, face-down. Three officers are holding him, while four others watch. An officer punches his arm with a hammer-type fist.
Four officers then lift his flaccid body off the ground. Again, he falls to the dirt. He lies for several seconds motionless. His legs writhe.
Again, four officers lift him. Again he falls. Again they drag him to his feet, but his legs wobble. As one officer appears to hold his hands on Martin's face, another punches the teen nine or 10 times on his forearm.
In one of the most violent moments, as the officers hold Martin upright, one of them appears to knee him in the back. His body jerks upwards, his head whiplashes and his heels leave the ground.
The officers' "restraint" techniques - as officials have called them - appear to last between 20 and 30 minutes.
Near the end, a white-frocked nurse, Kristin Schmidt, finally leans over the teen and removes her stethoscope from her neck. She attends to him for several minutes before an ambulance arrives and removes the youth on a stretcher.
State Rep. Gus Barreiro, a Miami Beach Republican whose first viewing of the tape last week added fire to the controversy, said upon seeing it again Friday that the tape still makes him scream.
"I keep yelling, 'Stop! Don't punch him anymore. He's not moving.' "
Herald staff writers Elinor J. Brecher, Marc Caputo and Jacob Goldstein contributed to this report.