Columbine High School massacre Potential Students") program. He found the transition to Ken Caryl Middle School difficult. Unlike the white caps of the jocks, Harris and Klebold wore black baseball caps. As was typical in the 1990s, they wore them backwards. Harris wore a KMFDM cap, and apparently did not wear it during the massacre. Klebold's cap had a Colorado Avalanche logo on the front and a Boston Red Sox logo sewn onto the back. Following the Columbine shooting, schools across the United States instituted new security measures such as see-through backpacks, metal detectors, school uniforms, and security guards. Some schools implemented school door
Columbine High School massacre in the shooting. The Columbine shootings influenced subsequent school shootings. Many school shooting plots mention it. Shortly after, a rash of copycat threats led to the closing of entire districts. One arrested student boasted he could "outdo" its number of casualties. The first copycat may have been the W. R. Myers High School shooting, just 8 days later, when a 14-year old Canadian student went into his school at lunchtime, with a sawed-off .22 rifle under his dark blue trench coat, and opened fire, killing one student. A month after the massacre, Heritage High School in Conyers, Georgia had a