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Biggest Study of Police Body Cams Yet Finds No Change in Use of Force or Citizen Complaints

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A landmark new study following officers in the nation’s capital has found no evidence that body cameras reduce allegations of police misconduct or officer use of force. More than 2,000 officers participated in the study, making it the largest of its kind in the US. Tracked over several months, Metropolitan Police Department (MPD) officers with body cameras received roughly the same number of civilian complaints as those without them and reported using force just about as often. Ultimately, the study by Washington, DC’s The Lab concluded that police departments “should not expect dramatic reductions in use of force or complaints, or other large-scale shifts in police behavior, solely from the deployment of this technology.”

According to the working paper released today, 2,224 officers participated in the randomized controlled trial. Of those, 1,035 did not have cameras (the control group) while 1,1189 did (the treatment group). Officers were observed during the three months before and three months after body cameras were implemented in DC. The Lab’s conclusion: body-worn cameras had no effect on either use-of-force or police misconduct complaints.


Police Misconduct Complaints


Researchers found no “statistically significant” difference between civilian complaints against cops with cams and those without them. Similarly, there was no difference between complaints filed in the three months before the cams were implemented and the three months after. The Lab tracked all complaints filed, whether they were ultimately dismissed or sustained by the MPD. In the discussion section of the paper, the researchers admit that MPD officers have unique training, as they’re assigned to the nation’s capital, and face elevated scrutiny. In any case, there was no observable impact.


The MPD defines use of force as “any use of force resulting in injury or a complaint of injury or pain where the injury or pain is directly associated with a member’s use of force.” That can include takedowns, tackles, use of batons and stun guns, and of course, guns. Officers given cameras reported using these techniques just as frequently as they had without them. Officers without cameras used the techniques as much as their counterparts and, as with civilian complaints, researchers didn’t observe an impact from the cameras.

Limitations and The Importance of Policy

Though this is the largest body camera study, it isn’t the first. Researchers have evaluated their effectiveness in Florida, California, and the UK. Results varied. A staggering 93 percent drop in complaints was found in one trial and a 15 percent increase in violence against officers wearing cameras was observed in another. The Lab’s researchers note that the high visibility of being an officer in the nation’s capital may affect officer behavior. As does the size. MPD has 3,800 officers. Most in the US have fewer than 10.


The Lab’s results may not match those of every department, but “recalibrating” the expectations for body cameras to “induce large-scale behavioral changes in policing,” as the researchers suggest, will be invaluable as they become more widespread. And the technology powering body cameras is outpacing the law. Though as many as one-third of police departments in the US use body cameras, the policies governing them are scattershot. Policies differ on when officers should record, when departments should release footage and whether cops can view their own footage before making a statement.

Community activists and law enforcement officials have lauded body cameras as a crucial part of police reform. These findings complicate that. Body cameras also introduce new privacy hurdles for communities, financial and administrative hurdles for police agencies, and accountability hurdles for them both. There won’t be an easy fix, but strong policies that demand police transparency are a critical first step.