Northeastern University's James Alan Fox joined the show this week to talk about his decades-long research on mass shootings. Working with USA Today and the Associated Press, he has spent years documenting shootings where four or more people are killed. He's also researched the killings to better understand how and why they happen.

He talked about how many members of the media have greatly expanded the definition of mass shooting and why it's causing confusion among the public. We also discuss some of the misnomers about what leads to mass shootings. Then we go over the real causes and some of the potential solutions.

Plus, I talk about my recent in-depth report on the first-ever Gun Makers Match. And I give an update on the fight over permitless carry in Louisiana.

Special Guest: James Alan Fox.