“In response to mass shootings, some schools and hospitals are installing microphones equipped with algorithms. The devices purport to identify stress and anger before violence erupts. Our testing found them less than reliable.”

The Violence Project’s Jillian Peterson commented on the practicality of these devices, saying, “I can’t imagine when it would be useful, honestly.”

Read more about these devices and their distribution here.

Headphones are recommended.

Source: ProPublica
Authors: Jack Gillum and Jeff Kao
Photography by Adrienne Grunwald