An analysis of mass shootings in the United States since the year 2002 shows that gun-wielding mass killers are more likely to strike where the Second Amendment right to bear arms has been supplanted by “gun-free zone” ordinances, be they federal, local, or specified by the owner of the property.
The Stanford University Libraries’ dataset of mass shootings (“Stanford Mass Shootings in America, courtesy of the Stanford Geospatial Center and Stanford Libraries”) was analyzed for mass shootings over the past 14 years.
The definition of a mass shooting for the Stanford database is three or more shooting victims injured or killed, not including the shooter. Shootings that are gang- or drug-related are not included.
The dataset includes 153 incidents going back to the beginning of 2002.
Research done at the Heritage Foundation found that fifty-four of the 153 incidents (35 percent) involved a shooter targeting people at random who were not relatives or adversaries of the attempted murderer.