Regardless of where one comes down on the debates about gun control, everyone seems to agree that keeping firearms out of the hands of unattended children is a good idea. After all, firearm-related injuries remain one of the leading causes of death among U.S. children, with close to 3,500 killed a year. The small and seemingly simple step of securing firearms in a locked cabinet makes a huge difference in protecting young children. By our estimates, approximately 5 percent of preschool age children live in homes in which their parents reported that they owned guns but did not store them in a secure and locked place. To address this problem, many states have implemented Child Access Prevention (CAP) laws. This collection of legislative approaches range from suggestive guidelines for storage behaviors in families with minors to more stringent requirements and harsher penalties for noncompliance, holding gun owners criminally liable regardless of whether someone gets hurt.

Unfortunately, little research exists to test whether these laws are actually associated with family firearm safety behaviors. A primary goal of our study, just published in the American Journal of Public Health, was to understand how gun storage behavior in families with young children varied across states with different CAP laws, controlling for a wide range of parent, family, and state-level factors that are often associated with gun ownership, generally, and gun safety behaviors, specifically. We found that the efficacy of state CAP laws seemed to rely on the general firearm legislative climate in each state. CAP laws were only associated with decreased likelihood of unsafe gun storage behaviors in states that had strong firearm legislation overall. Although we cannot infer causation from these findings, we hypothesize that parents may not be aware of the specific laws in their states but are more generally aware that their state has many laws that regulate gun use, prompting them to be more careful about the purchase and storage of firearms. We also think that having stronger general state laws could potentially affect which families own firearms -- parents who own guns in a state without any regulation may constitute a very different pool of people than those who own firearms in a state in which they have to jump through hoops, such as a background check, to get them.

Overall, these findings highlight that a significant proportion of children in the U.S. are living in homes where they can potentially access firearms, and these estimates are likely conservative due to underreporting arising from not wanting to share private or potentially embarrassing information or from parents' loose interpretation of what constitutes a 'safe' or 'locked' gun. Moreover, even laws that do not directly target the types of behaviors that result in young children accidentally accessing firearms could have potential spillover effects for the safety of children.

This is why comprehensive firearm legislation -- even legislation that doesn't seem to necessarily solve the immediate public health issue that politicians are responding to (such as a school massacre) -- could potentially be important.

Take, for example, proposed federal legislation on background checks that would have closed loopholes in firearm purchases at gun shows. Recent polls show broad bipartisan public support for this type of legislation, and, although it likely won't stop school massacres, it has potential spillover effects that may affect minors' access to firearms. Parents who do not keep their guns safe at home probably will not show up in a database of people with a diagnosed serious mental health illness, but having a mandated background check or waiting several days to return to a store to purchase a gun may create enough friction that could stop some parents who may be less able or inclined to take heed of their pediatrician's recommendations or abide by their state's CAP laws.

Ms. Kate C. Prickett is a PhD candidate with the Population Research Center and the Department of Sociology at the University of Texas at Austin.

Dr. Alexa Martin-Storey is an assistant professor with the Département de Psychoéducation, Université de Sherbrooke, Quebec, Canada.