In the weeks, months and even years leading up to the mass shootings in Sutherland Springs, Texas, Las Vegas, Nevada, and Tehama County, California, the perpetrators were stockpiling, and in one case building, guns. Devin Kelley bought guns illegally, despite his domestic violence conviction, and . Stephen Paddock went under the radar even after buying 47 guns. Kevin Neal was barred from owning firearms as part of a protective order, but reportedly built his own.
The big picture: Their stories reveal cracks in a system that lets mass killers slip through. Jeff Sessions has now ordered a review of the federal background check system due to the Sutherland Springs case.