Their goal is to stop the shooter at all costs they are to walk past wounded victims, as the aim is to prevent the shooter from killing or wounding more. There has been widespread adoption of high-strength body armor and patrol rifles by police departments across the United States in response to the increased active shooter threat. Police officers using this tactic are trained to move toward the sound of gunfire in formation and neutralize the shooter as quickly as possible. In fact, the majority of active shooters are stopped by a single officer. This tactic calls for a team to advance into the site of any ongoing shooting, but even with just a single officer if more are not available. That approach has been replaced by a tactic known as the Immediate Action Rapid Deployment tactic. Police followed a traditional tactic at Columbine: surround the building, set up a perimeter, and contain the damage. Police departments have reassessed their tactics and have since trained for Columbine-like situations after criticism over the slow response and progress of the SWAT teams during the shooting. Rachel's Challenge was started by victim Rachel Scott's parents, and lectures schools about bullying and suicide.

Some schools renewed existing anti-bullying policies. Virginia Tech, Sandy Hook, Stoneman Douglas, and Robb were four subsequent school shootings that far surpassed the casualties of the 1999 massacre, subsequently raising concern of gun violence in the United States. Despite the safety measures that were implemented in the wake of the tragedy at Columbine, school shootings continued to take place in the United States. Several social science experts feel the zero tolerance approach adopted in schools has been implemented too harshly, however, with unintended consequences creating other problems. Schools also adopted a zero-tolerance approach to possession of weapons and threatening behavior by students. Several schools throughout the country resorted to requiring students to wear computer-generated IDs. Some schools implemented the numbering of school doors to improve public safety response. Effects on schools įollowing the Columbine shooting, schools across the United States instituted new security measures such as transparent backpacks, metal detectors, school uniforms, and security guards. The shooting was the most covered news story of 1999, and third most followed by the American public of the entire decade, surpassing the death of John F. At the time, it was the deadliest shooting at a high school in American history. Around 50 minutes after the shooting began, Harris and Klebold took their own lives in the library, where the majority of their victims died.

On April 20, 1999, Columbine High School seniors Eric Harris and Dylan Klebold murdered 12 students and one teacher and injured 24 others. Further information: Eric Harris and Dylan Klebold

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