On today's Fresh Air... and interview with Mark Follman on mass shootings. You can listen to it here...
Three years ago, in July 2012, journalist Mark Follman heard about the Aurora, Colo., movie theater shooting rampage that left 12 people dead and felt compelled to learn more — not just about that incident, but about all the mass shootings that were occurring in America.
Follman, the national affairs editor of Mother Jones Magazine, began looking for information online, but it soon became evident that no good databases about the subject existed.
Since NRA whores in Congress got a ban on CDC research into gun violence MoJo created their own on mass shootings. There are different definitions for the term. It uses this definition
"An FBI crime classification report from 2005 identifies an individual as a mass murderer if he kills four or more people in a single incident (not including himself), typically in a single location."
Why four and not three or two? Who knows.
MoJo's article can be found here
with the full spreadsheet here
Without such data it's unclear what's the best approach to reduce such shootings. Apparently about 85% of the guns were purchased legally... but the vast majority of shooters had some signs of mental illness.