Key Points Question: What factors are associated with a mass shooting perpetrator’s decision to communicate their intent to do harm? Findings: This cross-sectional study of 170 perpetrators found that nearly half leaked their plans, with 44.3% of them leaking specific plans about a mass shooting. Leakage was associated with receiving counseling … [Read more...]
Communication of Intent to Do Harm Preceding Mass Public Shootings in the United States, 1966 to 2019
Psychosis and mass shootings: A systematic examination using publicly available data.
Mass shootings are often blamed on serious mental illness. This study assesses the role of psychosis in contributing to mass shootings along a continuum. The role of psychosis is compared with other motivations for mass shootings including employment issues, interpersonal conflict, relationship issues, hate, and fame-seeking. Perpetrators … [Read more...]
Presence of Armed School Officials and Fatal and Nonfatal Gunshot Injuries During Mass School Shootings, United States, 1980-2019
After deadly school shootings at Columbine, Sandy Hook, and Parkland, many states mandated School Resource Officers or provided funding for districts to hire them. Lawmakers also considered arming teachers. Florida now requires a law enforcement officer or trained school guardian in every school. By examining every recorded incident where one or … [Read more...]
Press Release – Study Finds Armed Officers Increase Mortality in School Mass Shootings
Saint Paul, Minn. -- More people die in school mass shootings where an armed officer is present according to a study published by Minnesota researchers in the peer-reviewed journal, JAMA Open Network on February 16, 2021. The study, led by Hamline University professor Dr. Jillian Peterson, examined every case since 1980 where one or more people … [Read more...]
Evaluation of ‘the R-Model’ crisis intervention de-escalation training for law enforcement
This study presents findings from a process and outcome evaluation of a custom crisis intervention and de-escalation training for law enforcement, delivered in-house to a suburban Minnesota police department (the R-Model: Research, Respond, Refer). Individual officer survey data showed the R-Model significantly decreased stigma and increased … [Read more...]