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POLICE Magazine editor David Griffith recently spoke with "Columbine" author Dave Cullen about the psychology of Eric Harris, law enforcement response the day of the massacre, the investigation, and how school shootings can be prevented.
The massacre of 12 students and a teacher at Columbine High School outside Denver, Colo., in April was the worst schoolyard carnage by students in this nation's history and many providing training lessons to law officers across the country for years.