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Dr. Michael Baden (R) and Prof. Shawn Parcells respond to questions from the media on Aug. 18, 2014. The family of Mike Brown, a teenager shot dead by a police officer in Ferguson, Missouri, paid for an independent autopsy. Reuters

Mike Brown had marijuana in his system when he was shot and killed by a police officer in Ferguson, Missouri, more than a week ago, a source close to the investigation told the Washington Post. The person added that the 18-year-old unarmed high school graduate had six to eight gunshot wounds on his body and was shot from the front.

The Post story came out just hours after Mary Case, the St. Louis County medical examiner who conducted the first autopsy on Brown, issued a statement on her findings, saying Brown was shot several times in the chest and head. The black teen was fatally shot by Officer Darren Wilson during an altercation on a Ferguson street, sparking local and national protests in the ensuing days.

The St. Louis County prosecutor’s office has received Case's report, but it has not been publicly released.

Dr. Michael Baden said Monday that at least six bullets struck the teen during the Aug. 9 shooting. Baden, the former chief medical examiner for New York City, conducted a preliminary autopsy on Sunday at the request of the teen's family. He added that Brown could have survived all of his wounds except for the shot that struck the top of his head.

Baden also wants to review the clothing that Brown was wearing when he died, which will provide additional information about the shooting. Baden said that Brown's toxicology results could take weeks or months to be made public.