Two police reports written the night that George Zimmerman shot Trayvon Martin said that Zimmerman had a bloody face and nose, according to police reports made public today. 
 
 The reports also note that two witness accounts appear to back up Zimmerman's version of what happened when they describe a man on his back with another person wearing a hoodie straddling him and throwing punches. 
 
 It has been such a contentious case that even the evidence is being disputed. 
 
 The police report states that Trayvon Martin's father told an investigator after listening to 911 tapes that captured a man's voice frantically callling for help that it was not his son calling for help. 
 
 But Tracy Martin, Trayvon's father, claims that is not true. The Martin family lawyer Ben Crump told ABC News that Tracy Martin initially listened to a distorted version of the 911 calls and said he could not identify the voice. But when he listened to a second tape that had been "cleaned," "He immediately broke down in tears because he knew it was his son calling for help," Crump said. 
 
 The new information is part of a trove of documents released by the Florida State Attorney today in the case against Zimmerman, who is charged with second degree murder for the Feb. 26 killing of Martin, an unarmed 17-year-old African American male. 
 
 Surveillance video of Martin in a store purchasing skittles right before the fatal incident was also released today. 
 
 Zimmerman, 28, is a multi-racial Hispanic man who volunteered for the neighborhood watch committee who claimed that he shot Martin in self-defense after the 6-foot tall, 160 pound teenager knocked him to the ground, banged his head against the ground and went for Zimmerman's gun. 
 
 The documents start with a criticism of Zimmerman's decision to follow the teenager, who Zimmerman said was looking suspicious. 
 
 "The encounter between George Zimmerman and Trayvon Martin was ultimately avoidable by Zimmerman, if Zimmerman had remained in his vehicle and awaited the arrival of law enforcement," an investigating officer wrote. 
 
 Zimmerman claims he got out of his vehicle to find a house number to let police know where he saw the allegedly suspicious person, and while returning to his car was knocked down by a punch in the nose and attacked by Martin. 
 
 Two police officers reported that when they arrived at the scene of the shooting, Zimmerman seemed to have a battered nose and bloodied face. One wrote that his "facial area was bloodied," and the back of his clothing was soiled with wet grass. 
 
 "Zimmerman was also bleeding from the nose and the back of his head," Officer Ricardo Ayala wrote. 
 
 Another officer wrote, "I saw that Zimmerman's face was bloodied and it appeared to me that his nose was broken." 
 
 Witnesses, whose names were redacted from the report, also lent support to Zimmerman's version of what happened. 
 
 "He witnesses a black male, wearing a dark colored 'hoodie' on top of a white or Hispanic male and throwing punches 'MMA (mixed martial arts) style,'" the police report of the witness said. "He then heard a pop. He stated that after hearing the pop, he observed the person he had previously observed on top of the other person (the male wearing the hoodie) laid out on the grass." 
 
 A second witness described a person on the ground with another straddling him and throwing punches. The man on the bottom was yelling for help, the witness told police. 
 
 The documents state that Zimmerman can be heard yelling for help 14 times on a 911 call recorded during the fight. 
 
 Yet another witness described the confrontation in emotional terms. 
 
 The witness heard "someone yelling, almost crying. Then I heard a gunshot." The witness wrote that he or she "saw a man on top of a guy laying on the ground. He was putting his hands on his neck or chest." 
 
 The man asked the witness to call 911. 
 
 "He stood up and took a couple steps away and put his hands on his head and then walked back over to the guy on the ground. He looked at him for a minute, then started to walk away toward the road. That is when the police walked up," the witness wrote. 
 
 The lead investigator on the case, Officer Christopher Serino, wrote that Zimmerman could be heard "yelling for help as he was being battered by Trayvon Martin." 
 
 Martin's death sparked public outrage after police released Zimmerman without any criminal charges for the killing. Zimmerman was later charged with second-degree murder, and the killing provoked widespread debate about racial profiling. 
 
 The autopsy also shows that Zimmerman shot Martin from a distance of between 1 inch and 18 inches away, bolstering Zimmerman's claim that he shot Martin during a close struggle. 
 
 Martin's autopsy report also revealed that there was a quarter-inch by half-inch abrasion on the left fourth finger of Martin, another indication of a possible struggle. 
 
 The teen, who lived in Miami, was in Sanford while serving a suspension for an empty marijuana bag discovered in his possession. Martin had THC, the drug found in marijuana, in his blood on the night of his death, according to the autopsy. His family told ABC News that it was "trace amounts" of THC. ||||| Starting in 1996, Alexa Internet has been donating their crawl data to the Internet Archive. Flowing in every day, these data are added to the Wayback Machine after an embargo period. ||||| Story highlights Martin would be alive if Zimmerman stayed in his vehicle, police said 
 
 Trayvon Martin was pronounced dead 3 minutes after firefighters and EMS arrived 
 
 Evidence of THC, an ingredient in marijuana, was found in Martin's blood, tests show 
 
 Firefighters find forehead "abrasions" and "bleeding" from Zimmerman's nose 
 
 Just over two weeks after the fatal shooting, and less than a month before an arrest was made, police in Sanford, Florida, urged prosecutors to take George Zimmerman into custody after arguing his killing of Trayvon Martin was "ultimately avoidable." 
 
 This disclosure came out Thursday, part of a wealth of information released that is related to the case, including the medical's examiner's finding that the 17-year-old Martin had traces of drugs in his system in an autopsy conducted hours after his death. 
 
 Overall, the newly released material paints the most complete picture yet of how investigators built the case, as well as its complexity. The police perspective was most succinctly stated in a March 13 "capias request" -- a request that someone be taken into custody -- sent to the state's attorney. It speaks to the fact that Zimmerman ignored a police dispatcher's advice not to chase Martin, as well as his communications with Martin prior to the shooting. 
 
 "The encounter between George Zimmerman and Trayvon Martin was ultimately avoidable by Zimmerman, if Zimmerman had remained in his vehicle and awaited the arrival of law enforcement, or conversely if he had identified himself to Martin as a concerned citizen and initiated dialog (sic) in an effort to dispel each party's concern" the request said. "There is no indication that Trayvon Martin was involved in any criminal activity." 
 
 In his 911 call just before the shooting, Zimmerman had speculated that the teen looked like he was "up to no good or he's on drugs or something." 
 
 But Martin's defenders have portrayed Zimmerman as the aggressor, accusing him of profiling the African-American teen. Plus, one expert notes the traces of the marijuana-related substance found in the teen's system, as measured hours after his death, don't necessarily speak to any level of intoxication, while another adds that marijuana use typically doesn't make people prone to aggression. 
 
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 Martin's blood contained THC, which is the psychoactive ingredient in marijuana, according to autopsy results released Thursday. The autopsy was conducted February 27, the day after the teenager was shot dead. 
 
 Toxicology tests found elements of the drug in the teenager's chest blood -- 1.5 nanograms per milliliter of one type (THC), as well as 7.3 nanograms of another type (THC-COOH) -- according to the medical examiner's report. There also was a presumed positive test of cannabinoids in Martin's urine, according to the medical examiner's report. It was not immediately clear how significant these amounts were. 
 
 No precise levels on the urine were released. 
 
 Dr. Michael Policastro, a toxicologist, cautioned against reading too much into the blood THC levels, adding that one cannot make a direct correlation between those findings and a level of intoxication. 
 
 He also noted levels of THC, which can linger in a person's system for days, can spike after death in certain areas of the body because of redistribution. 
 
 And Dr. Drew Pinsky, an addiction specialist who hosts a show on CNN's sister network HLN, added that marijuana typically does not make users more aggressive. 
 
 Concentrations of THC routinely rise to 100 to 200 ng/ml after marijuana use, though it typically falls to below 5 ng/ml within three hours of it being smoked, according to information on the National Highway Traffic Safety Administration's website. 
 
 While some states have zero-tolerance policies for any drug traces for driving while impaired, others set certain benchmarks, the website of California's Department of Alcohol and Drug Programs notes. In Nevada, that equates to 2 ng/ml for THC and 5 ng/ml for THC-COOH, also known as marijuana metabolite. The cutoff level in Ohio is 2 ng/ml for THC and 50 ng/ml for THC-COOH. 
 
 According to the medical examiner's report, which was one of several documents on the case released Thursday by the office of special prosecutor Angela Corey, Martin died from a gunshot wound to chest fired from "intermediate range," within 36 inches. 
 
 The autopsy report lists the manner of death as a homicide. 
 
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 Zimmerman, 28, is charged with second-degree murder for killing Martin in the Sanford neighborhood where the African-American teen was staying. 
 
 Martin's father, Tracy, had taken his son with him to Sanford, about four hours away from the boy's home and where the father's fiance lived, after the teen was suspended for 10 days from Michael M. Krop High School in Miami. 
 
 According to records obtained by the Miami Herald, Martin had been suspended from school three times: once for writing graffiti on a door, another time for school truancy and the last time due to drug residue being found in his backpack. 
 
 Speaking of her son's suspension to CNN's Anderson Cooper, Sybrina Fulton said, "Whatever he had dealings with the school, it was not criminal, it was not violent, he's never been arrested." 
 
 Just before the shooting, Zimmerman called 911 to complain about a suspicious person in his neighborhood. 
 
 In the call Zimmerman, a neighborhood watch volunteer, said he was following Martin after the teen started to run, prompting the dispatcher to tell him, "We don't need you to do that." 
 
 Zimmerman apparently disregarded that advice. 
 
 Much has been made about whether Zimmerman during that call used a racial epithet in referring to Martin. But an FBI analysis, released Thursday, determined that the word could not be definitively identified "due to weak signal level and poor recording quality." 
 
 A screaming voice could be heard on other 911 calls placed by neighbors, with some speculating those screams came from Martin and others that they belonged to Zimmerman. The FBI did not make a final determination either way, citing several reasons including the fact they came during "an extreme emotional state," there weren't enough words to make a good comparison and the sound quality was low and distant. 
 
 Zimmerman claimed, according a police report released earlier, that he'd been "assaulted (by Martin) and his head was struck on the pavement." 
 
 According a report from the Sanford Fire Department , released Thursday, Zimmerman had "abrasions to his forehead," "bleeding/tenderness to his nose," and a "small laceration to the back of his head" when emergency personnel arrived at the scene at 7:27 p.m., six minutes after they were first called. 
 
 By that time, Martin had no apparent pulse, according to the fire and EMS report. Emergency personnel attempted mouth-to-mask resuscitation and chest compressions, to no avail. He was pronounced dead at 7:30 p.m. 
 
 Prosecutors have said Zimmerman, who is a white Hispanic, killed the unarmed teenager unjustly after profiling him. Zimmerman, who has pleaded not guilty, has said that he shot Martin in self-defense. 
 
 The start of the trial hasn't been set. 
 
 The case put a spotlight on race relations, spurring protests nationwide and drawing prominent civil rights leaders to central Florida denouncing the actions of Sanford police and calling for Zimmerman's arrest. Special prosecutor Angela Corey announced he'd been charged on April 11, weeks after Sanford police initially declined to do so. 
 
 It also raised questions about gun laws, as well as the merits of the "Stand Your Ground" law in Florida, and similar laws in other states that allow people to use deadly force anywhere they feel a reasonable threat of serious injury or death.
– Get ready for a deluge of information in the Trayvon Martin/George Zimmerman case, as prosecutors today released a cache of related documents. Some early samples: Pro-Zimmerman: His lawyers surely hope lots of attention will be paid to the fact that Trayvon apparently smoked pot at some point before the altercation. (It's not clear when or how much.) The autopsy found traces of the drug THC in his system, the active ingredient in marijuana, reports CNN. Also, ABC News notes that two witness accounts given to police "appear to back up Zimmerman's version" of events. Pro-Trayvon: Prosecutors will no doubt point to the police conclusion that the shooting was "ultimately avoidable," had Zimmerman "remained in his vehicle and awaited the arrival of law enforcement." The Orlando Sentinel leads its story with it. Zimmerman photo: The documents include a grainy copy of a photo police took of Zimmerman after the shooting in which he appears to have a bloody nose, notes AP. See the photo here. Trayvon's belongings: He had $40.15 on him, along with a packet of Skittles, a red lighter, headphones, and a photo pin in his pocket. See for yourself: MSNBC has the documents here in PDF form, and the Sentinel has crime-scene photos here. Click to read about a damning assessment of the Sanford police by the New York Times here.