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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 reporter in October 2024. He started as a fact checker in January 2023 and contributes to our collaboration with the The Gigafact Project to fight misinformation online. Kertscher is a former longtime newspaper reporter, including at the Milwaukee Journal Sentinel. He is a contributing writer for Milwaukee Magazine and sports freelancer for The Associated Press.