Someone stopped by searching for “What is the persentage of mass shootings have happened in a gun free zone?”
There are an awfully lot of “gun free zones” in this United States. Guns have been banned from Post Offices for almost 90 years, from many government buildings since the turn of the 20th Century, from schools since the “Gun Free Zone Act of 1995,” and industries since well before the War of Southern Secession.
An all encompassing survey of all of the past and present gun free zones would be a staggering undertaking. And to make matters worse, some define a “mass shooting” as one in which four or more people were shot, others four or more were killed, others set the bar at two shot or two killed, still others at five, and still others at three.
And, to pile on further complications, a mass shooting is almost always a mass murder.
Rephrasing the question to “What was the percentage of mass murders in gun free zones,” and leaving the question of definition to the reader; if we confine ourselves the period from 1991 to the present the percentage of mass shootings in gun free zones is 1 divided by the number derived from your definition of a mass shooting – subtracted from 1.
That is, if you agree with Mother Jones Magazine and say there were 151 mass murders in that period, then 1 ÷ 151 = 0.00662 – 1.0 = 0.993375; so then, 0.9933775 percent of mass shootings in the United States since 1990 have occurred in gun free zones.
In a sane world that would result in Congress and 50 State legislatures going into special session to ban gun free zones. Unfortunately, this is not a sane world.