Dylann Roof's drug-related arrest weeks before the Charleston, S.C., shootings should have blocked his purchase of a handgun, law officials say.  on drug charges , center, is escorted from the Sheby Police Department in Shelby, N.C. FBI director James Comey says Roof, the gunman in the Charleston church massacre should not have been allowed to purchase the gun used in the attack, and on July 10 attributed the problem to incomplete and inaccurate paperwork related to an arrest of Roof weeks before the shooting. (AP Photo/Chuck Burton, File) Photo: Chuck Burton, STF / AP
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