(CNN) -- There are dueling narratives in the death of Michael Brown: one says he was holding his hands up in surrender as officer Darren Wilson shot him, and the other says Brown was the aggressor, and Wilson shot as Brown was rushing toward him. Investigators will certainly use high-tech tools to try to get to the truth, but they'll also use a tool as old as the ancient Greeks: the autopsy. Three autopsies have been done on Brown's body: one by St. Louis County; one privately commissioned by the family and one performed Monday by medical examiners from the U.S. military.
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Three autopsies have been conducted in Michael Brown's death
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Pathologists looking at signs of struggle, wounds and gunpowder
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Autopsies can provide valuable information to investigators
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But it's uncommon for them to provide all the answers, expert says
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