The deaths of Alton Sterling in Baton Rouge, Louisiana, and Philando Castile in Falcon Heights, Minnesota, were both captured on video.

So are the deaths of Walter Scott, Eric Garner, so many others. That's not new. Back in 1991, Rodney King's beating was captured

by video camera from a balcony, an early use of recording gear to capture police brutality. Since then,

of course, the technology has gotten better, and so have bystanders at using it.

In Baton Rouge last Tuesday, members of an organization called Stop the Killing reportedly heard of Sterling's encounter with the cops on a police scanner and went to the scene.

Stop the Killing produces documentaries to expose street violence of all kinds,

and it didn't go with the intention of immediately posting the footage,

preferring to wait to see how transparent the police would be.

So they're saying, well, we have video, we have body cameras,

we have everything that we need to do a thorough investigation.

That stopped the killing founder Arthur Reed, a former gang member turned activist, also known as Silky Slim, on NPR.

Then the next day they come out and say, well, the body cameras fell off the officers so we don't have that video.

And then they didn't produce the store surveillance footage.

So that let us know that we needed to release what we had nationally.

We keep those images out there of what we're doing to ourselves, as well as what the police

are doing to us, he told the New York Times.

We don't think you can look at one without looking at the other.

On Wednesday in Falcon Heights, Minnesota, the source of

the recording was closer to the victim than perhaps ever before, when moments after police

shot Philando Castile during a traffic stop, his partner Diamond Reynolds began streaming

his death on Facebook Live. Stay with me. We got pulled over for a busted tail light in the back. And the police

just, he's covered. He killed my boyfriend. And then in the back of the police car, she turned

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