John Lott:
Unfortunately, the problems with the reports have continued during the Trump administration. The latest FBI report, released in May, misses still more cases. The FBI claims that from 2014 to 2017 there were 90 active shooter cases and only seven where permit holders stopped these attacks.
In all, the FBI claims that concealed handgun permit holders have stopped 3.2 percent of active shooter incidents.
But the bureau misses at least 23 cases where permit holders saved the day. That means they stopped 11.5 percent of active shooter incidents from 2000 to 2017. We at the Crime Prevention Research Center are more confident that we have all of the cases from 2014 to 2017, when 16.5 percent of attacks were stopped.