A core mission of kindergarten-through-12th grade (K-12) schools across the United States is to provide a safe environment in which school-age children can thrive and where teaching and learning can proceed free of crime and violence. As schools strive to fulfill their educational mission, one of the challenges they face is minimizing the risk of criminal and violent acts that occur within and outside school boundaries. These incidents affect not just
KEY FINDINGS■ A systems approach requires conceptualizing school physical security as a component of the broader school safety system. Such an approach also includes the elements of prevention and response and recovery. Protection and risk mitigation extend beyond the physical security space to affect and interact with important elements of school violence prevention, such as student mental health and school climate, as well as emergency response and recovery efforts.■ School physical security is a system consisting of physical security equipment and technology, building and architectural design features, people and personnel, policies and procedures, and associated training and exercise requirements. The equipment, technology, and design features that a school has in place to protect its campus are all interrelated within the physical security space and have cost and other implications that local education agencies (LEAs) will need to consider. The people and personnel that schools have to provide security, as well as related policies, procedures, and training, ensure that these interconnected technologies, equipment, and site and building design features work in concert and in the service of the larger system.■ LEAs will be best placed to achieve security and safety benefits when they take a layered approach to protection and mitigation. Measures in place at the campus perimeter, school grounds, building perimeter, and building interior provide incremental protection against threats and help prevent single points of failure. How schools prioritize certain layers over others will depend on their unique contexts, including the surrounding neighborhood, campus and building layout, student population, and geographical location.