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 plans and reasons for the massacre, including the ways they hid their arsenals and deceived their parents. Most of these were shot in the Harris family basement, and are known as the Basement Tapes. Approximately thirty minutes before the attack, they made a final video saying goodbye and apologizing to their friends and families. In December 1999, before anybody else had seen them, Time magazine published an article on these tapes. The victim's family members threatened to sue Jeffco. As a result, select victim families and journalists were allowed to see them, and they were then kept from the public