Video of cop killing man won’t be public until footage is played at trial

It seems inevitable that the bulk of the nation's police forces will one day be outfitted with body cams and dash cams.

The stocks of two of the leading companies producing some of this hardware, Digital Ally and Taser, attest to that. They are up substantially as police departments big and small are gobbling up such devices left and right. The authorities say the rush for the surveillance gear is being done in the name of transparency, to build a reviewable record of law enforcement's interactions with the public.

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