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Firearm background checks and suicide: Learning more about firearms and suicide

The majority of recent US bills loosen gun restrictions, thus rekindling the discussion about the relationship between guns and crime. This column presents research that investigates the effect of gun control on suicide. Using background checks as a proxy for gun ownership, the study finds a positive link between the access to guns and firearm suicide rates. This suggests that an increased availability of a particular suicide method can lead to more suicides.

Editor’s Note: This column, originally published in January 2014, is newly relevant to policy in the light of the recent tragic events. 

In the year following the Sandy Hook Elementary School shooting in Newtown, Connecticut, states throughout the US introduced approximately 1,500 bills on guns. Of the 109 bills that have become laws in the past year, 70 actually loosened gun restrictions. These looser laws tend to be in states where Republicans control the state legislature. The 39 passed bills that tightened gun restrictions tend to occur in Democratic controlled states. Even though most public polls show support for stricter background checks and firearm sales, the federal government has been unable to pass any laws on gun control, including stricter background checks.

There are a number of possible reasons why the behaviour of Congress members does not appear to coincide with the beliefs of their constituents. 

  • One reason is that voters that want stricter gun control laws vary significantly in how much control they want.

Although a majority of American voters support stricter gun legislation, a larger majority opposes an outright ban of guns. With less cohesion among gun control supporters, politicians can cater to passionate minority gun owners to win their votes, but still keep some of the votes from the gun control supporters by siding with them on other issues they value more, such as education (Bouton et al., 2013).

  • Another reason that gun control laws may have trouble passing, despite voter support, is that the causal effect of firearms is hard to determine.

Historic measures of firearm availability at the state and local level have been difficult to obtain, and past studies looking at the effect of firearms have relied on changes in laws or a variety of gun proxies to measure the role of firearms. Studies have mostly focused on the relationship between guns and crime, with a number of studies showing that looser gun laws are associated with less crime (for example, Lott and Mustard 1997, or Helland and Tabarrok 2004). A seemingly equal number of studies show that more guns lead to more crime using a variety of gun proxies (for example, Duggan 2001 or Cook and Ludwig 2006).

Fewer studies have looked at the relationship between firearms and suicide, even though firearm suicide rates are higher than homicide firearm rates in nearly every state. The lack of research on the firearm-suicide relationship is due to the fact that one of the most commonly used measures for firearms in an area is the fraction of suicides that involve a firearm. To accurately explore the relationship between firearms and suicide, a new proxy for guns is necessary.

Firearm background checks

Since 1998, the FBI has required background checks for every firearm bought through a licensed dealer. The background checks involve a call to an FBI hotline which takes information about the buyer and the type of gun purchased. It is a quick process, usually taking two minutes. Most of the 2% of denials are because a potential buyer has been convicted of a felony, used illegal substances, or had a restraining order placed on them. The shooter at Virginia Tech in 2007, Seung-Hui Cho, was able to buy a gun legally and passed a background check, even though he was declared mentally ill in 2005.

Monthly background checks in every state have been tracked by the FBI since its inception. The background checks measure the intention of an individual to purchase a firearm, something that past proxies have been unable to capture. Using the firearm background check data, I am able to explore the relationship between changes in state background check rates and suicide rates.

Background checks and suicide

Using state level data between 1999 and 2007, my study shows that increases in the state background check rate are associated with a significant increase in firearm suicide in the current and following year.

  • The total suicide rate increases insignificantly when background checks increase, suggesting that there is a weak 'instrumentality effect' where increased access to a particular method of suicide can potentially influence the decision to carry out a suicide.

A number of factors that influence suicide are controlled for, including the unemployment rate, the insurance rate, and the bankruptcy rate. Because the analysis looks at changes in state background checks over time, state-specific attributes related to suicide that do not change over time are controlled for. If one state is more 'accepting' of suicide than another because of a historical event, or because of the general attitude in the state, this will not drive the results found in the analysis since those attributes do not change over time.

It may be possible that individuals are buying firearms with the intention of carrying out a suicide. This would mean that firearm purchases are driven by suicidal behaviour. In order to address this concern, youth suicide rates are examined. If a youth obtains access to a firearm, they presumably have to be around someone who purchased a firearm and likely went through a background check. Youths themselves cannot go through a background check with the intention of carrying out a suicide. My analysis shows that increases in state background check rates by adults are associated with a significant increase the youth male firearm suicide rate, and an insignificant increase in youth male suicide rates. This provides further evidence that access to firearms can increase the likelihood of suicide, and the suicide is carried out using a firearm.

Concluding remarks

Although the background check data from the FBI measures the intention to purchase a firearm from a licensed dealer, they do not account for all firearms in a state. Not all gun shows require a background check. Neither do online purchases. Private sales and transfers across state lines are not accounted for with the background check data.

In April 2013, a US Senate Bill was proposed that would have required more extensive background checks at gun shows and for online purchases. The bill was unable to get the 60 votes needed to move forward. According to the results of my study, passing such a bill could potentially decrease suicides in both adults and youth. Although suicide reduction was not the primary motivation behind the bill, limiting firearm access can have a significant impact on suicidal individuals. As Congress continues to debate gun policy, one of the potential consequences of their inaction, and the looser gun laws in many states, is more lives lost due to suicide.


Bouton, L, P Conconi, F J Pino, and M Zanardi (2013), “Guns and Votes”, CEPR Discussion Paper 9726.

Cook, P and J Ludwig (2006), "The social costs of gun ownership", Journal of Public Economics, vol. 90, pp. 379-91.

Duggan, M (2001), "More guns, more crime", Journal of Political Economy, vol. 109 (5), pp.1086-1114.

Helland, E and A Tabarrok (2004), "Using Placebo laws to test 'more guns, less crime", Advances in Economic Analysis and Policy, vol. 4(1), pp. 1-7.

Lang, M (2013), "Firearm Background Checks and Suicide", The Economic Journal, vol. 123, pp. 1085-1099.

Lott, J and D Mustard (1997), "Crime, deterrence and right-to-carry concealed handguns', Journal of Legal Studies, vol. 26, pp. 1-68.

NICS, Federal Bureau of Investigation. (2011), "Total NICS firearm background checks by state", November 30, 1998-November 30, 2011.

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