Title: PolitiFact | Dan Patrick says only two mass shootings since 1950 occurred outside of gun-free zones
Headings: 
Every "one of the mass shootings except two in America since 1950 have been" in "gun-free zones."
Dan Patrick says only two mass shootings since 1950 occurred outside of gun-free zones
Defining "mass shooting"
Lott summarizes research
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Content: That’s in the spirit of the Gun-Free School Zones Act, revised by Congress in 1996, which states it’s unlawful for an individual to knowingly carry a firearm that’s been part of interstate or foreign commerce in a school zone or within 1,000 feet of the grounds of a public, parochial or private school. But "mass shooting" has had a range of definitions. In a 1996 paper, Lott and a fellow researcher presented a multi-part definition ruling out incidents connected to other crimes and applying other limits. The paper defined "a multiple public shooting as one in which two or more people are killed or wounded in a church, business, bar, street, government buildings, schools, public transit, place of employment, park, health care facility, mall or restaurant. We excluded multiple shootings that were byproducts of other crimes (e.g., a robbery or drug deal) or that involved gang activity (e.g., drive-by shootings), professional hits or organized crime. We also did not count as a multiple shooting serial killings or killings that took place over the span of more than one day," the authors wrote. There are less restrictive definitions. A 2008 FBI report said that over the previous 30 years, a mass murder was described as four or more murders occurring during the same incident, with no distinctive time period between the murders. A 2013 report by the Congressional Research Service said there’s no agreed-upon definition of "mass shooting," so it would define public mass shootings as "incidents occurring in relatively public places, involving four or more deaths—not including the shooter (s)—and gunmen who select victims somewhat indiscriminately." Meantime, an FBI spokesman, Stephen Fischer, advised us by email that a 2012 law set the threshold for a "mass killing" as three or more people killed.