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erin dnt griffin security clearance _00004329.jpg

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    Navy Yard gunman's red flags overlooked?

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Navy Yard gunman's red flags overlooked?

CNN's Drew Griffin examines numerous possible red flags in Navy Yard shooter Aaron Alexis' past.

Navy Yard gunman's red flags overlooked?

CNN's Drew Griffin examines numerous possible red flags in Navy Yard shooter Aaron Alexis' past.