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 the materials suggested behavior patterns consistent with a "malignant narcissism ... pathological narcissistic personality disorder with borderline and antisocial features, along with some paranoid traits, and unconstrained aggression". The link between bullying and school violence has attracted increasing attention since the massacre. Both of the shooters were classified as gifted children who had allegedly been victims of bullying for four years. Early stories following the shootings charged that school administrators and teachers at Columbine had long condoned bullying. Critics said this could have contributed to triggering the perpetrators' extreme violence. Klebold said on the Basement Tapes, "You've been giving us