Does Imminent Violence Have a Sound?

A new guard of audio detectors is angling for a role in school security by identifying aggressive sounds before physical violence breaks out.
Demand for novel school security systems rises with every mass shooting—but a ProPublica analysis of these devices yielded mixed review at best.
Any early warning system for school tragedies would be welcome. But what kind of sounds—if any—are precursors to violence? Many mass shooters were rather quiet before committing mass murder. When tested on students, they often picked up on the wrong signals—like coughing, and not the right ones—like screaming.


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