Mass shootings went down when the assault weapons ban was passed. Mass shootings tripled when the law expired.

PolitiFact said it was mostly true.

There was no mistake that President Joe Biden wanted a concrete response to the Uvalde, Texas, killings.

Biden said in a prime time national address that he spent his career as a senator and as vice president working to pass common sense gun laws. They work and have a positive impact. Mass shootings went down when the assault weapons ban was passed. Mass shootings tripled when the law expired.

President Joe Biden

The gun legislation was passed in 1994. Large-capacity magazines that allow people to fire more bullets before reloading were among the changes.

There are some numbers that back Biden up. Mass shooting deaths involving assault weapons fell slightly in the decade after the federal assault weapon ban, but then rose in the decade that followed, according to a New York University study. That is the time frame for Biden's statement.

There is no debate that the pace and deadlines of mass shootings increased after the ban ended. The 1994 law restricted the use of large-capacity magazines, but recent work shows that threat is still present.

A limited law

The 1994 law bannedmanufacture, transfer, and possession of 118 firearm models and all magazines holding more than 10 rounds. People who already own such weaponry can keep it. There were 1.5 million assault weapons in private hands when the ban took effect. 25 million weapons had large-capacity magazines.

The ban ended in 2004.

The ban on assault weapons and large capacity magazines ensured the effects of the ban, according to a study commissioned by the U.S. Justice Department.

The 1994 law was not an on-off switch for these firearms. People who wanted to use these weapons in a mass shooting would have a chance to acquire them if the hardware remained in circulation.

The ban and the death toll

A group led by epidemiologist Charles DiMaggio homed in on mass shooting deaths in a study.

Mass shootings are defined in different ways. At least four people died in the incidents looked at by DiMaggio's group.

They found that the number of mass shooting deaths fell during the years of the ban. DiMaggio shared his data. In the decade after the ban ended, deaths more than tripled.

There was a modest decline in deaths between the decade before and the decade after the ban.

The death toll from mass shootings went from an average of 4.8 per year during the ban years to an average of 23.8 per year in the decade afterwards.

There are many factors that lead to gun deaths. DiMaggio's team put mass shooting deaths in terms of the total number of firearm homicides. Between 1994 and 2004, the yearly rate fell by 9 people per 10,000 firearm homicides.

Mass shooting deaths were 70% less likely during the ban.

There are other studies that show that fewer people died in mass shootings when the ban was in effect. In the years after the ban, shootings in which six or more people died were less common and less deadly.

Larger magazines play a key role

Christopher Koper is a professor at George Mason University. Both sides in the gun control debate received material from the 2004 study written by Koper.

The role of large-capacity magazines that hold more than 10 rounds has been assessed recently.

According to the latest data, larger magazines have been linked to a rising death toll. He said that the most striking trend was the rise in deaths after the ban ended.

Large-capacity magazines have a lot of that firepower.

Considering that mass shootings with high capacity semiautomatics are more lethal and injurious than other mass shootings, it is reasonable to argue that the federal ban could have prevented some of the recent increase in persons killed and injured in mass shootings.

State laws that limit magazine size were studied by researchers. The rate of fatal mass shootings was linked to those laws.

Ban’s impact remains unclear

DiMaggio urged caution on the question of whether the ban drove the decline.

He told us when his study came out that it was hard to prove cause and effect.

Andrew Morral is a researcher at the RAND Corporation, a consulting nonprofit research group.

Morral said they don't believe there is strong evidence that they were not the cause of the reductions.

Morral said that limits on weapons and large-capacity magazines are associated with fewer and less deadly mass shootings. logical considerations should guide lawmakers in the absence of stronger data.

Morral said that the absence of strong scientific evidence was not a good rationale for taking no action.

Our ruling

Mass shootings went down after the passage of the assault weapons ban, according to Biden. Mass shootings tripled when the law expired.

Bill Clinton said there was a drop in mass shooting deaths after the ban on some types of assault weapons was passed.

A study supports Biden. Millions of assault weapons and large-capacity magazines remained in circulation during the ban, and that makes it hard to tease out the law's impact.

This claim is mostly true.

Our Sources

  • President Biden spoke on the school shooting in Uvalde, Texas.

  • There have been changes in US mass shooting deaths associated with the 1994-2004 federal assault weapons ban.

  • The effects of banning the sale of assault weapons and high-capacity magazines on mass shooting were discussed.

  • The Effect of Large-Capacity Magazine Bans on High-Fatality Mass Shootings was published in the American Journal of Public Health.

  • Legislation that reduces gun violence is being proposed by the school of public health.

  • Assessing the potential to reduce deaths and injuries from mass shootings through restrictions on assault weapons and other high-capacity semiautomatic firearms.

  • Bill Clinton claimed that the assault weapons ban led to a drop in mass shooting deaths.

  • Did mass shooting deaths fall under the 1994 assault weapon ban? Bill Clinton's claim was checked on August 7, 2019.

  • Christopher Koper is an associate professor in the Department of Criminology, Law and Society at George Mason University.

  • Andrew Morral is the leader of the Gun Policy in America Initiative.

  • Email exchange, Charles DiMaggio, professor, Department of Surgery, Division of Trauma and Critical Care Surgery, New York University School of Medicine.

The Austin American-Statesman ran a fact-check on mass shootings after the assault weapon ban ended.