The anger. The numbness. The flashbacks. Mass shootings such as the one in San Bernardino, Calif. this week can haunt, for years, the police officers who are often first to the scene. It is a trauma that Sergeant A.J. DeAndrea of Arvada, Colo. knows firsthand. He was one of the first to enter Columbine High School in 1999, searching for the gunmen who killed 13 people and injured 21 more.
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