School shootings, a tragic occurrence throughout history, have garnered heightened attention in recent decades, largely due to widespread media coverage and the rise of social media platforms. Recent school shootings have created an increased need for school safety and security. Schools have added cameras, metal detectors, electronic door locks, armed security guards, and specific drills that students and staff practice in the event a shooter enters a school building. Students participating in school lockdown drills may exhibit increased anxiety towards school and education. This study aimed to determine the psychological impact of increased security and safety protocols on high school students. Students were evaluated using an anxiety-related inventory before and after a school lockdown drill. The first part of this survey included questions from the Penn State University "Student Level of Worry" assessment. Since "Worry" is a component of generalized anxiety, this survey was chosen for simplicity and availability (Joos, 2012). The second part of this survey was a selection of questions from a survey developed by the U.S. Department of Education entitled U.S. Department of Education (ED) School Climate Survey used to evaluate perceived school safety and school environment (National Center for Education Statistics, 2015). This study was conducted in a suburban high school in the eastern United States. The findings of this study present a mixed picture. While there are statistically significant differences in mean responses before and after a lockdown drill within certain subgroups of questions related to "worry," the small effect sizes suggest only a small increase in worry following a drill. Following the outcomes of this study, students' perceptions of school safety remained largely unchanged, yet they acknowledged an increased sense of preparedness. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]