Support WBURSchools Have Become More Secure Since Columbine, Experts SayScott NeumanDecember 14, 2012 SharePolice gather at the east entrance of Columbine High School in Littleton, Colo., on April 20, 1999. School security has improved markedly since the Columbine shooting, experts say, but there still are problems. (AFP/Getty Images)
