New evidence in Zimmerman case: Trayvon texted about fighting, smoking marijuana 
 
 On Feb. 13, he sent a text to a friend, acknowledging that 10-day suspension: "I got in sum trouble 2day." 
 
 The evidence that George Zimmerman's attorneys have uncovered on Trayvon Martin's cellphone paints a troubling picture of the Miami Gardens teenager: He sent ;days after being found with an empty marijuana baggie in his backpack. 
 
 Trayvon Martin about a week before he was killed. 
 
 The friend responded, "Ok so wen u comin bck 2 skool." 
 
 Trayvon's response: "Da 29th." 
 
 The defense evidence packet also includes other information from Trayvon's school records, among them five videos from a Miami-Dade schools police investigation that turned up several pieces of women's jewelry in Trayvon's backpack and a screwdriver, what authorities there described as a burglary tool. 
 
 Those records were not made public because of student-privacy laws. 
 
 In a prepared statement, Benjamin Crump, the attorney for Trayvon's family, described the new pieces of evidence as "irrelevant red herrings" and "a desperate and pathetic attempt by the defense to pollute and sway the jury pool." 
 
 He predicted the judge would find them irrelevant and ban them at trial. 
 
 After Zimmerman's attorneys released the text messages and photos, Assistant State Attorney Bernie de la Rionda filed a new motion asking for a gag order that would prohibit attorneys from discussing the case with reporters. 
 
 That's his third such request. The judge is expected to take up the issue Tuesday. 
 
 And late Thursday, Zimmerman's attorneys filed paperwork asking the judge to delay the start of his trial for six weeks. 
 
 His attorneys said last week they would ask for a delay because they need more time to hire an audio expert to counter the testimony of a state witness expected to testify that the voice heard screaming for help in the background of a 911 call was Trayvon's. 
 
 Staff writer Arelis R. Hernández contributed to this report. rstutzman@tribune.com or 407-650-6394. jeweiner@tribune.com or 407-420-5171. ||||| Prosecutors have released video footage of Trayvon Martin buying sweets and a drink in a Florida convenience store minutes before he was shot and killed in a confrontation with a neighbourhood watch leader. 
 
 The scenes recorded at the 7-Eleven close to the Retreat at Twin Lakes development in Sanford show Martin, 17, wearing a black hooded top and beige trousers, walking up to the counter and paying. 
 
 Soon after leaving the shop Martin got into a fight with George Zimmerman, who had already called police to report a "suspicious" black male in the neighbourhood. Martin was shot dead by a single shot to the chest at point-blank range, the gunshot heard on recordings of several 911 calls made by neighbours. 
 
 The video is among the latest in a batch of evidence released on Friday by prosecutors who have charged Zimmerman, 28, with second-degree murder. 
 
 It represents the first public glimpse of the unarmed teenager on 26 February, the night he was killed in an incident that led to race protests and the resignation of the local police chief. The Sanford police department originally released Zimmerman without charge after he claimed he acted in self-defence, and he was arrested in April only after the appointment of a special prosecutor to re-examine the evidence. 
 
 The haul of evidence released by state attorney Angela Corey's office over the last two days includes a toxicology report that showed Martin had traces of marijuana in his system, medical records confirming bloody injuries to Zimmerman's head, and testimony by Martin's father that it was not his son's voice heard on 911 recordings crying for help. 
 
 Additionally, there were numerous witness statements, many contradicting each other over such details as how many shots were fired and which of the two was on top of the other during their fight. And one police report reveals that detectives wanted to charge Zimmerman with manslaughter even after Bill Lee, then the chief of the Sanford police department, had told reporters there was insufficient evidence to justify such a charge. 
 
 The confrontation was "entirely avoidable", detective Chris Serino wrote, if Zimmerman had returned to his car or engaged Martin in conversation. 
 
 Among the various audio recordings of interviews with witnesses is one of a teenage girl in Miami, where Martin lived, who told prosecutors she was on the phone to her friend and heard Zimmerman approach him. 
 
 The girl, whose identity has not been revealed, said she heard Martin say: "Why you following me for?" 
 
 She said: "I hear this man, like this old man, say, 'What are you doing around here?'" then said she heard a bumping sound followed by what she thought was a scuffle. 
 
 "I could hear it a little bit, 'Get off, get off,' then the phone just hung up," she said. 
 
 Zimmerman faces at least 25 years in jail if he is convicted. No date has yet been set for the trial and he remains free on $150,000 bail. 
 
 His lawyer, Mark O'Mara, warned on Friday it would be a mistake to draw any conclusion from the partial evidence so far released. "Looking at it piecemeal is what has caused some of the problems in the past with the case," he said in an interview with CBS News. 
 
 "It's sort of important that we all wait until all the evidence is out. Let's deal with it all once we have it, and deal with it in the courtroom." ||||| 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.