Martin Kaste

Why don't the police fire warning shots? That's a question that comes up a lot, especially after controversial shooting deaths.

Last fall, the International Association of Chiefs of Police and 10 other law enforcement groups got together to work out a consensus policy on the use of force — a sort of model document for local departments that want to update their rules. When the document came out in January, it contained a surprise: It allowed for warning shots.

In 2014, the New Orleans Police Department made a bold move into body cameras, requiring all uniformed officers to wear them and record their contact with the public.

The program got off to a rough start: NPR documented spotty use by officers, and, crucially, how hard it was for the office of the city's independent police monitor — which handles complaints about police misconduct — to gain access to videos of police use of force.

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