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A 2024 RAND report and four experts in mass shootings said they know of no research concluding that the presence of armed officers deters school shootings.

The armed officers claim was made Dec. 19 by school safety advocate Ryan Petty in an interview about a mass shooting Dec. 16 at Abundant Life Christian School in Madison, Wisconsin. 

That school didn’t employ an officer.

Petty’s daughter was killed in the 2018 mass shooting at a Parkland, Florida, school, which did.

Petty said the connection is “proven.” He didn’t cite research to Wisconsin Watch.

Whether arming school resource officers “leads to net harms or benefits … could be addressed with strong scientific research designs or observational studies,” RAND said.

A 2023 University at Albany-RAND study found school resource officers reduce some violence and increase weapon detection, “but do not prevent gun-related incidents.”

A 2021 U.S. DOJ-funded study said “data suggest no association” between armed officers and deterring mass shootings.

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Tom Kertscher joined Wisconsin Watch as a full-time Milwaukee-based reporter in October 2024 after starting as a freelance Fact Briefs reporter in January 2023. In addition to contributing to Wisconsin Watch’s collaboration with The Gigafact Project to combat online misinformation, he reports on Wisconsin policy, labor, energy and the rapid expansion of data centers across the state. Kertscher is a former longtime reporter at the Milwaukee Journal Sentinel, a contributing writer for Milwaukee Magazine and the author of two sports books, on Al McGuire and Brett Favre.