Hey, everyone, a quick note about today's show.

We're talking about incidents of police brutality

and some of the descriptions may be upsetting.

You might want to wear headphones

if you're listening around children.

According to an investigation by the Guardian,

at least 258 black people were killed by police officers in 2016.

Tragically, that was not an unusual development,

but the widespread release of video footage

of some of those encounters was.

On July 5, 2016,

Alton Sterling was shot and killed

while two bystanders took videos on their phones.

The next day, July 6,

Philando Castile was shot and killed.

His fiance recorded the immediate aftermath of the shooting.

A week after these shootings,

in the wake of national protests,

Ethan Zeckerman was trying to make sense of the killings.

He wrote an article in the MIT Technology Review called

why we must continue to turn the camera on police.

My hope was that the ubiquity of mobile phone cameras

...