Priorities for future research
Despite the proliferation of gun restriction policy proposals after the Sandy Hook Elementary School shooting in December 2012, we are faced with critical gaps in the research around these policies as they concern serious mental illness. The limited existing literature regarding the effectiveness of gun restriction policies targeting serious mental illness, the potential for such policies to exacerbate negative attitudes about persons with serious mental illness, and the potential for gun restriction policies to inhibit mental health treatment seeking among those with serious mental illness suggest a need for future research. Five key gaps in the existing literature should be addressed. To date, little is known about how implementation of federal gun restriction policy for serious mental illness affects violence by persons with serious mental illness in states with different policy, political, and demographic contexts; the effects of gun restriction policies on suicide; how to best implement gun restriction policies in cases of serious mental illness; attitudes about gun restriction policies in the population with serious mental illness; and the effects of gun restriction policies on mental health treatment seeking.
Although recent findings by Swanson and colleagues (
56) indicate that federal gun restrictions in cases of serious mental illness appear to prevent arrests for violent crime in Connecticut, it is unclear how implementation might affect violence from this population in other states. State variation in factors such as criteria used for involuntary commitment, demographic characteristics, prevalence of gun ownership, gun policies, and availability of mental health services may influence the effects of federal gun restriction policy pertaining to serious mental illness. Future research should evaluate the effects of implementation of federal gun restriction policy in diverse states across the nation.
To date, no studies have examined how gun restriction policies for serious mental illness affect suicide. According to the Centers for Disease Control and Prevention Web-Based Injury Statistics Query and Reporting System database, 60% of all gun deaths in the United States are suicides, and although most suicide attempts do not involve guns, they are used in half of suicide fatalities (
75,
76). Firearm availability is associated with heightened risk of suicide (
77–
79), and suicide is the tenth leading cause of death in the United States and the second leading cause among young adults ages 25–34 (
76). Studies show a consistent link between mental illness and risk of suicide (
80–
82), and depression is the mental health condition most strongly associated with suicide risk (
80). Given that depression rarely leads to involuntary commitment to psychiatric care, however, it is unclear how existing federal gun restriction policy for serious mental illness might affect suicide (
56). Innovative state-level gun restriction policies could also affect suicide: an evaluation of Indiana’s law allowing police to seize weapons without a warrant if they believe an individual is dangerous because of serious mental illness or other reasons found that weapons were most commonly seized in cases related to suicide (
33).
Although it is critically important not to criminalize suicide, carefully implemented gun restriction policies—for example, with voluntary components, with time-limited restrictions, and integrated with existing initiatives such as crisis response programs—have the potential to reduce suicides. Suicide rates have remained high in recent years (
76), and the Surgeon General has identified suicide as a public health priority (
83). Future research should consider how existing state and federal gun restriction policies focusing on serious mental illness may affect suicide.
Little is known about implementation of state gun restriction policies for cases of serious mental illness. One exception is Parker’s 2010 study (
33) of implementation of Indiana’s law allowing police to seize firearms from dangerous persons without a warrant. Parker found that after two years of implementation of this law, suicide was the leading reason for gun confiscation (56% in 2006 and 71% in 2007) and that serious mental illness was a factor in only 10% of cases. In contrast, little is known about how other states, California for example, implement laws that allow or require law enforcement to seize the guns of persons with serious mental illness. How often are guns seized under each type of serious mental illness restriction? What is the process for seizing guns? What are the boundaries of legal authority to search for and seize guns of individuals prohibited from possessing guns due to serious mental illness? Answers to these questions are critical to understanding both the effectiveness and unintended consequences of proposed policies.
Stigma, in particular, can be both exacerbated and mitigated by the details of policy implementation. For example, having a trained crisis response team call ahead and subsequently arrive in an unmarked car to seize firearms may be less stigmatizing than having local police arrive unannounced, with their lights flashing, for the same purpose. While multiple state and federal policies to seize firearms from persons prohibited from having a gun due to serious mental illness are currently under consideration, implementation of such policies is an important area for future research.
Research studying the implementation of gun restriction policies in the case of serious mental illness should be accompanied by studies examining the attitudes of persons with serious mental illness toward such policies. To our knowledge, only one relevant study exists. A 2012 study examined veterans’ support for several gun restriction proposals as a means to prevent suicide (
84). Study results suggested that veterans were potentially willing to support a policy that would temporarily remove guns during periods of high risk of suicide (
84). However, veterans’ tentative support for such a policy was contingent on characteristics of implementation, including having a trusted clinician make the determination of suicide risk (
84). Although many veterans supported the idea of temporary gun removal to prevent suicide, they questioned where guns would be stored, who would have access, and how difficult it would be to have firearms returned (
84). These findings suggest that implementation may play a critical role in whether persons with serious mental illness support gun restriction policies that pertain to them; this is an area that warrants future research. In addition, although one study suggests that gun restriction policies in the case of serious mental illness do not exacerbate negative public attitudes toward persons in that population (
61), it is unclear how such policies influence the attitudes of the persons with serious mental illness. With literature showing that self-stigma is adversely related to treatment seeking (
68), understanding how persons with serious mental illness perceive gun restriction policies that pertain to their condition is an important area for research.
Finally, to our knowledge no studies exist to inform the question of whether gun restriction policies have a chilling effect on treatment seeking by persons with serious mental illness. This issue plays a central role in political debates about gun restrictions in the case of serious mental illness, but to date no research exists to inform those debates. The potential for gun restriction policies or other reporting requirements to inhibit mental health treatment seeking should be a priority for future research.