The article itself doesn't contain any research statistics, but links to one site that did some research. The results of which were inconclusive. Also of note,

The article itself doesn't contain any research statistics, but links to one site that did some research. The results of which were inconclusive. Also of note, the purpose of active shooter training isn't to prevent the situations, but to save lives if it does happen. I do agree that training for these situations doesn't address the root cause, and I would love to see that get addressed. Is there a technological approach that can be taken to help the psychological and social issues that drive these events?