Abstract
This introduction provides an overview to the special issue, which marks the twentieth anniversary of the shootings at Columbine High School by considering the effect on policy addressing school violence and mass shootings. We asked each of the contributors to consider changes in their area of interest over the past two decades as well as future research and policy issues. The resulting five contributions take various forms: three are traditional scholarly articles, one is a personal commentary, and one is an afterword that combines a scholarly format with professional reflection. In our introduction, we summarize each one. As each article identifies the need for continued work in this area, and we conclude by providing a few examples of this research.
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