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Acts of mass violence are not a new phenomenon in the United States. Law enforcement and homeland security officials prepare, prevent, respond, investigate, and assist in prosecuting offenders in these events. How then can the greater homeland security community effectively avert future acts of mass violence with its even broader mission set? Physical and technological security countermeasures are not enough to prevent these types of incidents from occurring. The purpose of this chapter is to briefly give an overview of some of the research into the indicators and traits exhibited by perpetrators of mass violence and the best practices that have evolved to intervene as a result. Recognizing the common traits and behaviors displayed by past attackers, their surrounding influences and the common traumas most of them have experienced, is an essential first step in developing effective strategies to prevent acts of mass violence.