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This is Scientific Americans' 60-second science.

I'm Erica Barris. Got a minute?

The last few years have seen numerous widely publicized incidents of civilians,

black men in particular being killed by police.

In response, many officers are now required to wear body cameras.

The theory is that technology will lessen the likelihood of an officer using unnecessary force to diffuse a situation.

Now, research finds that body cameras do indeed appear to keep encounters between police and civilians from intensifying to the point where a civilian files a complaint, in a few

jurisdictions anyway. The study is in the journal Criminal Justice and Behavior. Researchers

collected data from seven police departments in the U.K. and the U.S. that serve a total population

of 2 million people. The data represented over 1.4 million hours logged by nearly 2,000

police officers in 2014 and 2015. Officers were randomly assigned to either wear or not wear

body cameras week by week. When the police wore the cameras, they were required to have them on

at all times. The year before the study, a total of 1,539 complaints were

filed against officers at the seven sites. But during the course of the body camera experiment,

a total of just 113 complaints were filed, a reduction of 93%. Six of the seven sites saw

complaint reductions of at least 88%.

...