Study: Militarization of police does not reduce crime

A new look at existing data by LSU researchers refutes the Trump administration's claims.

Study: Militarization of police does not reduce crime
Credit: Megan Varner/Getty
  • The United States Department of Defense gifts surplus military equipment and clothing to local police departments.
  • The militarization of police coincides with a significant loss of trust in law enforcement from the American public.
  • Militarized police departments are more likely to interact violently with their communities.

Watching coverage of protests in American streets, many of us have been shocked to witness what modern policing often looks like. Even putting aside the reason for many of these demonstrations in the first place—allegations of police brutality—what we see onscreen marching towards protestors is chilling. We witness police garbed in helmets, flak jackets, tactical dress, and carrying assault rifles, backed by weaponry designed for the battlefield, not the nation's thoroughfares.

The primary source of this equipment and clothing is the Federal government's 1033 program, which has been described as "Uncle Sam's Goodwill Store." This surplus military equipment (SME)—or "reutilized" gear as the Department of Defense (DOD) calls it—is granted, for free, to local law enforcement agencies, or "LEAs." WIRED estimates the Pentagon has gifted to local police some $7.3 billion worth of military equipment and clothing.

Concerned about the manner in which this militarization has affected policing, and following 2014's Ferguson protests, President Obama curtailed the program. The Trump administration removed these limits in 2017, claiming research had proved militarization reduces crime.

A new study from Louisiana State University (LSU) revisits that research, finding it incomplete and inconsistent. The researchers, led by LSU political scientist Anna Gunderson, collected their own more comprehensive and accurate data and concluded that militarizing local police does not actually reduce crime.

A wide lack of support

Credit: Andrew Caballero-Reynolds/Getty Images

It's no wonder that more than half of the American public no longer trusts the police. It's hard not to get the impression that for many police departments, the mission has changed from one of support for its communities to an attempt to intimidate and dominate its members.

Studies back this up. Police whose departments use military equipment are more often violent with community members and are more likely to kill them. Neither is this a small problem at the margins of policing: Over 1,000 people are killed by police annually.

In spite of the Trump administration's faith in the soundness of the 1033 program, others from across the political spectrum disagree. On the right, the Charles Koch Foundation asserts, "This erosion of public confidence in law enforcement and low support for militarization impedes law enforcement's ability to effectively secure public safety." From the left, the American Civil Liberties Union says, "We advocate for a return to a less dangerous, more collaborative style of policing. We should not be able to mistake our officers for soldiers."

Sketchy records

The Pentagon

Credit: JeremyAdobe Stock

Gunderson explains to LSU Media Center that, "scholars rely on accurate data to track and analyze the true effect of police militarization on crime. Policymakers also need accurate data to base their decisions upon. However, to-date, we do not have reliable data on SME transfers to local police and sheriffs through the federal government."

The research cited by the Trump administration was a study done by the American Economic Association based on SME data collected through a 2014 Freedom of Information Act request. Having a look at that data themselves, along with other FOIA 2014 data released by National Public Radio and newer data from 2018, the LSU researchers found that things didn't quite line up. Where FOIA suggests certain counties received SME, NPR's data showed no such transfer. Similarly, NPR reported departments receiving items such as weapons, grants that were not reflected in the 2018 data as expected.

"When we looked at the data and ran the replications, nothing looked like the results being cited by the Trump Administration," Gunderson recalls. "We spent a year trying to diagnose the problem."


The LSU researchers' conclusion was the the previously released SME data from the DOD was too inconsistent to produce reliable insights. They conducted their own analysis, aligning newer data with country-level LEA data, to derive a cohesive, accurate picture that allowed them to more definitively assess who got SME transfers and who didn't, and what effect it had on local crime statistics.

They found no indication that SME transfers led to a reduction in crime. The study concludes, "we find no evidence that federal distributions of SME to local LEAs across the United States reduce crime rates, neither violent nor nonviolent crime rates, in the jurisdictions that receive it."

Gunderson adds:

"This is a cautionary tale about the importance of oversight. The most important thing for policymakers and the public to know is that you can't justify giving surplus military equipment to police departments on the grounds it will lead to a reduction in crime. There is no evidence for that. You can't claim this program is important because it reduces crime."

What's more says, the report, "because of serious data problems and debatable methodological choices in prior studies, the empirical foundations on which social scientists, along with policymakers and the public, stand when making causal claims about the effects of the transfers of SME may be no firmer than quicksand."

An artist's depiction of Lola.

Tom Björklund
Surprising Science
  • Researchers recently uncovered a piece of chewed-on birch pitch in an archaeological dig in Denmark.
  • Conducting a genetic analysis of the material left in the birch pitch offered a plethora of insights into the individual who last chewed it.
  • The gum-chewer has been dubbed Lola. She lived 5,700 years ago; and she had dark skin, dark hair, and blue eyes.
Keep reading Show less

"Acoustic tweezers" use sound waves to levitate bits of matter

The non-contact technique could someday be used to lift much heavier objects — maybe even humans.

Levitation by hemispherical transducer arrays.

Kondo and Okubo, Jpn. J. Appl. Phys., 2021.
Surprising Science
  • Since the 1980s, researchers have been using sound waves to move matter through a technique called acoustic trapping.
  • Acoustic trapping devices move bits of matter by emitting strategically designed sound waves, which interact in such a way that the matter becomes "trapped" in areas of particular velocity and pressure.
  • Acoustic and optical trapping devices are already used in various fields, including medicine, nanotechnology, and biological research.
Keep reading Show less

Cockatoos teach each other the secrets of dumpster diving

Australian parrots have worked out how to open trash bins, and the trick is spreading across Sydney.

Surprising Science
  • If sharing learned knowledge is a form of culture, Australian cockatoos are one cultured bunch of birds.
  • A cockatoo trick for opening trash bins to get at food has been spreading rapidly through Sydney's neighborhoods.
  • But not all cockatoos open the bins; some just stay close to those that do.
Keep reading Show less
Culture & Religion

Godzilla and mushroom clouds: How the first postwar nuclear tests made it to the silver screen

The few seconds of nuclear explosion opening shots in Godzilla alone required more than 6.5 times the entire budget of the monster movie they ended up in.