Throughout 2015, there have been 52 school shootings within the United States that have left 30 individuals dead and another 53 injured (Reuters-USA, 2015). Since Friday, December 14, 2012, the date of the Sandy Hook Elementary School shooting, in which 26 people lost their lives, there has been on average one school shooting per week. It is essential that schools find ways to protect the students in the educational environment. The purpose of this qualitative case study was to identify what preventative measures are in place to deter, detect, and delay a school shooting from two different Chicago suburban high schools. Four staff members were interviewed from two different high schools in the Midwest. Additionally, documents were examined to understand the current practices of identifying a student that could potentially become an active shooter. Data was collected and analyzed from personal interviews, observations, and documents. The following research questions were used to guide this research study: Research Question #1--What practices do two Chicago suburban high schools use to deter, detect and delay a possible active shooter until the arrival of first responders? Research Question #2--What criteria is in place, at these high schools, to try to identify students that need an intervention prior to them engaging in violent behavior? Five major findings were identified: 1) Physical and psychological preventative measures need to be instituted. 2) Accountability of students needs to be maintained during crisis. 3) Identification of students in need of an intervention. 4) Treatment of students in need. 5) Emergency Operations Plans for guidance on policy and procedures. The findings will assist educators, law enforcement, superintendents, and parents with creating strategies to develop and build a secure educational environment where students can learn. The implications of this study are compelling, as all educators, law enforcement, superintendents, and parents share a role in giving a child the ability to learn in a safe environment. Additionally, this research adds to the body of knowledge that can assist educators in providing an environment where children can go to learn without fear of gun violence. [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.]