--- description: “The modern 24-hour news cycle hampers law enforcement’s ability to conduct a successful investigation” title: Ferguson: Michael Brown Investigation Will Take Time, Feds Say image: https://static.time.com/v3/assets/bltea6093859af6183b/blt1777f833c152074a/6986a01ef983e74a2f04f492/2014-08-19t022912z_1939620015_gm1ea8j0.jpg?branch=production&width=3840&quality=75&auto=webp&crop=16:9 ---  * [U.S.](/section/us/) ## U.S. Update your preferences in [Account Settings](/account/preferences/) Close * [justice](/tag/justice/) ## justice Update your preferences in [Account Settings](/account/preferences/) Close # Ferguson Probe Will Take Time ## Video: Ferguson's Countdown to Curfew [Watch (HLS stream): Ferguson's Countdown to Curfew](https://cdn.jwplayer.com/manifests/7TmLGuKX.m3u8) (5:10)  _Published 2014-08-17. Countdown to Curfew compress_ by [David Von Drehle](/author/david-von-drehle/) ## David Von Drehle Update your preferences in [Account Settings](/account/preferences/) Close Aug 19, 2014 4:52 PM CUT  Demonstrators march down West Florissant during a peaceful march in reaction to the shooting of Michael Brown, near Ferguson, Missouri Aug. 18, 2014. Demonstrators march down West Florissant during a peaceful march in reaction to the shooting of Michael Brown, near Ferguson, Missouri Aug. 18, 2014.Lucas Jackson—Reuters by [David Von Drehle](/author/david-von-drehle/) ## David Von Drehle Update your preferences in [Account Settings](/account/preferences/) Close Aug 19, 2014 4:52 PM CUT Despite the chaos on the streets of Ferguson, Mo., and in-fighting among local authorities over crowd control, the investigation into the Aug. 9 shooting death of Michael Brown, 18, by police officer Darren Wilson is going smoothly, the U.S. Attorney on the case tells TIME. FBI agents have successfully canvassed the area around the shooting scene for witnesses and are sharing what they’ve learned with St. Louis County investigators, said Richard G. Callahan, U.S Attorney for the Eastern District of Missouri. An autopsy by a top U.S. military forensic examiner was completed on Monday and “physical evidence is being analyzed.” There are no plans, however, to make details of the investigation public before the information is presented to a St. Louis County grand jury—a process that will take weeks or months. Callahan acknowledged the tension between the needs of investigators and the demands of the media and protesters. “The modern 24-hour news cycle hampers law enforcement’s ability to conduct a successful investigation,” he said, because hasty or partial releases of information can taint the testimony of witnesses. “While the lack of details surrounding the shooting may frustrate the media and breed suspicion among those already distrustful of the system, those closely guarded details give law enforcement the best yardsticks for measuring whether witnesses are truthful,” Callahan said. “Without those yardsticks, an investigation becomes more of a guessing game or popularity contest than a search for the truth.” The U.S. Attorney’s comments to TIME came on the eve of U.S. Attorney General Eric Holder’s scheduled visit to Missouri. Holder is expected to try to reassure the public that Brown’s death is getting a full and fair investigation. So far, the public has been treated to dueling accounts and partial disclosures, leading President Obama on Monday to warn of the dangers of drawing conclusions. “I have to be very careful about prejudging before the investigation is completed,” Obama said. And how might that information become public? Sources tell TIME that St. Louis County Prosecuting Attorney Robert McCulloch will likely present the information to the grand jury, which will decide whether to indict Wilson. If the officer is cleared of wrongdoing, results of the investigation will become public record under Missouri’s Sunshine Law. If Wilson is charged with a crime, it’s possible that aspects of the case will remain secret until his trial. On a parallel track, Justice Department officials are determining whether to press charges under federal civil rights laws. ### Witness Tension Between Police and Protestors in Ferguson, Mo.  A man backs away as law enforcement officials close in on him and eventually detain him during protests over the death of Michael Brown, an unarmed black teenager killed by a police officer, in Ferguson, Mo., Aug. 11, 2014. Whitney Curtis—The New York Times/Redux  Riot police force protestors from the business district into nearby neighborhoods in Ferguson, Mo. on Aug. 11, 2014. Scott Olson—Getty Images  A child uses a rag to shield his face from tear gas fired by riot police, who used it to force protestors from the business district into nearby neighborhoods in Ferguson, Mo. on Aug. 11, 2014. Scott Olson—Getty Images  Police officers keep watch from an armored vehicle as they patrol a street in Ferguson, Mo., on Aug. 11, 2014 Mario Anzuoni—Reuters  Police officers ride an armored vehicle as they patrol a street in Ferguson, Mo. on Aug. 11, 2014. Mario Anzuoni—Reuters  A demonstrator raises his hands in front of of a police officer in Ferguson, Mo. on Aug. 11, 2014. Mario Anzuoni—Reuters  Riot police lock down a neighborhood in Ferguson, Mo. on Aug. 11, 2014. Scott Olson—Getty Images  People raise their hands in the middle of the street as riot police move toward their position trying to get them to disperse, in Ferguson, Mo. on Aug. 11, 2014. Jeff Roberson—AP  Demonstrators raise their hands and chant "hands up, don't shoot" during a protest over the killing of Michael Brown on in Clayton, Mo. on August 12, 2014. Scott Olson—Getty Images  Civil rights leader Rev. Al Sharpton speaks about the killing of teenager Michael Brown at a press conference held on the steps of the old courthouse in St. Louis on Aug. 12, 2014. Scott Olson—Getty Images  Police take up position to control demonstrators who were protesting the killing of teenager Michael Brown in Ferguson, Mo. on Aug. 12, 2014. Scott Olson—Getty Images  Demonstrators protest the killing of teenager Michael Brown in Ferguson, Mo. on August 12, 2014. Scott Olson—Getty Images  Demonstrators protest the killing of teenager Michael Brown outside Greater St. Marks Family Church in St. Louis on Aug. 12, 2014. Scott Olson—Getty Images  Police stand watch as demonstrators protest the shooting death of teenager Michael Brown in Ferguson, Mo. on Aug. 13, 2014. Scott Olson—Getty Images  A demonstrator throws back a tear gas container after tactical officers worked to break up a group of bystanders on Chambers Road near West Florissant in Ferguson on Aug. 13, 2014. Robert Cohen—St. Louis Post-Dispatch/MCT/Zuma Press  Police officers work their way north on West Florissant Avenue clearing the road of people in Ferguson, Mo. on Aug. 13, 2014. Robert Cohen—St. Louis Post-Dispatch/AP  Demonstrators protest the shooting death of teenager Michael Brown in Ferguson, Mo. on Aug. 13, 2014. Scott Olson—Getty Images  People run through smoke in Ferguson, Mo. on Aug. 13, 2014. Jeff Roberson—AP  A protester takes shelter from smoke billowing around him in Ferguson, Mo. on Aug. 13, 2014. David Carson—St. Louis Post-Dispatch/AP  An explosive device deployed by police flies in the air as police and protesters clash in Ferguson, Mo., on Aug. 13, 2014 Jeff Roberson—AP  Thousands of demonstrators peacefully march to the spot where Michael Brown was shot and killed by police in Ferguson, Mo. on Aug. 14, 2014. Jeff Roberson—AP  Demetrus Washington joins other demonstrators protesting the shooting death of teenager Michael Brown in Ferguson, Mo. on Aug. 14, 2014. Scott Olson—Getty Images  Demonstrators protest outside of Greater St. Marks Family Church in Ferguson, Mo. on Aug. 14, 2014. Lucas Jackson—Reuters  Protesters light candles as they take part in a peaceful demonstration in Ferguson, Mo. on Aug. 14, 2014. Lucas Jackson—Reuters  Missouri State Highway Patrol Captain Ron Johnson (L) speaks to protesters as he walks through a peaceful demonstration as communities continue to react to the shooting of Michael Brown in Ferguson, Mo. on Aug. 14, 2014. Lucas Jackson—Reuters  A young child looks out from a car as demonstrators drive down West Florissant Avenue protesting the shooting and death of Michael Brown in Ferguson, Mo. on Aug. 15, 2014. Scott Olson—Getty Images  A demonstrator walks through smoke launched by police after a skirmish in Ferguson, Mo. on Aug. 15, 2014 Scott Olson—Getty Images  A demonstrator protests on Florissant Ave in Ferguson, Mo. on Aug. 16, 2014. Jon Lowenstein—NOOR for TIME  Children walk past police officers during a demonstration in Ferguson, Mo. on Aug. 16, 2014. Jon Lowenstein—Noor for TIME  Protestors help a man who was injured by tear gas thrown by police after refusing to disperse after the midnight curfew in Ferguson, Mo. on Aug. 17, 2014. Jon Lowenstein—Noor for TIME  Protestors throw canisters in Ferguson, Mo. on August 18, 2014. Jon Lowenstein—Noor for TIME  Protestors demonstrate against the killing of Michael Brown by police officer Darren Wilson in Ferguson, Mo. on August 17, 2014. Jon Lowenstein—NOOR for TIME  A protestor during demonstrations in Ferguson, Mo. on August 17, 2014. Jon Lowenstein—Noor for TIME  A protestor retaliates against police in Ferguson, Mo. on Aug. 17, 2014. Jon Lowenstein—Noor for TIME  A protestor throws a canister of tear gas back at police during demonstrations in Ferguson, Mo. on Aug. 17, 2014. Jon Lowenstein—Noor for TIME  Police wait to advance after tear gas was used to dispersed a crowd in Ferguson, Mo. on Aug. 17, 2014. Charlie Riedel—AP  A protestor holds a sign that reads "stop killing us" amid clouds of tear gas in Ferguson, Mo. on Aug. 17, 2014. Jon Lowenstein—Noor for TIME  Police wait to advance after tear gas was used to disperse a crowd in Ferguson, Mo. on Aug. 17, 2014. Charlie Riedel—AP  Tear gas rains down on a woman kneeling in the street with her hands in the air during a demonstration in Ferguson on Aug. 17, 2014\. The "hands up, don't shoot" pose became the defining gesture of the protests. Scott Olson—Getty Images  Protesters attempt to treat a woman who was in a cloud of tear gas thrown by police in Ferguson, Mo. on Aug. 17, 2014. Lucas Jackson—Reuters  Demonstrators march down West Florissant Ave. during a peaceful march in reaction to the shooting of Michael Brown near Ferguson, Mo. on Aug. 18, 2014. Lucas Jackson—Reuters  Demonstrators march down West Florissant during a peaceful march in reaction to the shooting of Michael Brown, near Ferguson, Mo. on Aug. 18, 2014. Lucas Jackson—Reuters  Police tackle a man who was walking down the street in front of McDonald's in Ferguson, Mo. on Aug. 18, 2014. Laurie Skrivan—St. Louis Post-Dispatch/AP  Law enforcement officers watch on during a protest on West Florissant Avenue in Ferguson, Mo. on Aug. 18, 2014. Michael B. Thomas—AFP/Getty Images  Demonstrators cover their faces as tear gas fills the air as police fire the gas against an unruly crowd protesting the shooting death of Michael Brown in Ferguson, Mo. on Aug.18, 2014 Joe Raedle—Getty Images  A protestor wearing a gas mask stands with his hands up while facing armed police in Ferguson, Mo. on Aug. 18, 2014. Abe Van Dyke—Demotix/Corbis  Police fire tear gas in the direction of where bottles were thrown from crowds gathered near the QuikTrip on W. Florissant Avenue in Ferguson, Mo. on Aug. 18, 2014. David Carson—St Louis Post-Dispatch/Polaris  Demonstrators stand in the middle of West Florissant as they react to tear gas fired by police during ongoing protests in reaction to the shooting of teenager Michael Brown, near Ferguson, Missouri, August 18, 2014. Lucas Jackson—Reuters  Demonstrators protest against the fatal shooting of Michael Brown in Ferguson, Mo. Aug. 19, 2014. Joshua Lott—Reuters  A police officer in riot gear detains a demonstrator protesting against the shooting of Michael Brown, in Ferguson, Mo. on Aug. 19, 2014. Joshua Lott—Reuters  Police officers in riot gear watch demonstrators protesting against the shooting of Michael Brown from the side of a building in Ferguson, Mo. on Aug. 19, 2014. Joshua Lott—Reuters  Two protesters sit with their faces covered during a peaceful protest in Ferguson, Mo. early on Aug. 20, 2014. Michael B. Thomas—AFP/Getty Images  A man is doused with milk and sprayed with mist after being hit by an eye irritant from security forces trying to disperse demonstrators in Ferguson, Mo. early on Aug. 20, 2014. Adrees Latif—Reuters  In this photo taken with a long exposure, protesters march in the street as lightning flashes in the distance in Ferguson, Mo., Aug. 20, 2014. 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