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Rather than debate whether “people” kill people or “guns” kill people, a reasonable approach to facilitate prevention is that “people with guns kill people.” The problem is more complex than simple slogans and requires careful study and analysis of the different psychological factors, behavioral pathways, social circumstances, and cultural factors that lead to gun violence. Whether prevention efforts should focus on guns because they are such a powerful tool for violence, on other factors that might have equal or greater impact, or on some combination of factors should be a scientific question settled by evidence. Toward this end, the American Psychological Association (APA) commissioned this report, with three goals. First, this report is intended to focus on gun violence, recognizing that knowledge about gun violence must be related to a broader understanding of violence. Second, the report reviews what is known from the best current science on antecedents to gun violence and effective prevention strategies at the individual, community, and national levels. Finally, the report identifies policy directions, gaps in the literature, and suggestions for continued research that can help address unresolved questions about effective strategies to reduce gun violence. For over a decade, research on gun violence has been stifled by legal restrictions, political pressure applied to agencies not to fund research on certain gun-related topics, and a lack of funding. The authors of this report believe the cost of gun violence to our society is too great to allow these barriers to remain in place. For over a decade, research on gun violence has been stifled by legal restrictions, political pressure, . . . and a lack of funding. The authors of this report believe the cost of gun violence to our society is too great to allow these barriers to remain in place.

The Role of Mental Health and Mental Illness:

An important focus of this report is the role that mental health and mental illness play in why individuals commit firearmrelated violence and how this can inform preventive efforts. This focus undoubtedly brings to mind shootings such as those in Newtown, CT, Aurora, CO, and Tucson, AZ. However, it is important to realize that mass fatality incidents of this type, although highly publicized, are extremely rare, accounting for one tenth of 1% of all firearm-related homicides in the United States (CDC, 2013a). Moreover, serious mental illness affects a significant percentage of the U.S. population, with prevalence estimates in the general population as high as 5%

(Substance Abuse and Mental Health Services Administration [SAMHSA], 2012). This is quite significant, given that the term serious mental illness is typically reserved for the most debilitating kinds of mental disorder, such as schizophrenia, bipolar disorder, and the most severe forms of depression, but can include other mental disorders that result in acute functional impairment. Although many highly publicized shootings have involved persons with serious mental illness, it must be recognized that persons with serious mental illness commit only a small proportion of firearm-related homicides; the problem of gun violence cannot be resolved simply through efforts focused on serious mental illness (Webster & Vernick, 2013a).

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