The Columbine effect is the legacy and impact of the 1999 Columbine High School massacre. The shooting has had an effect on school safety, policing tactics, prevention methods (including gun control and metal detectors), and inspired numerous copycat crimes, with many killers taking their inspiration from Eric Harris and Dylan Klebold by describing the two perpetrators as being martyrs or heroes. The shooting has also had a significant impact on popular culture, with Harris and Klebold often seen and mentioned in several forms of media.