Think the Taser saves lives? Unsettling 'Killing Them Safely' wants you to reconsider

With the intensified focus on use of force in police departments, the unsettling documentary "Killing Them Safely" couldn't be timelier.

Filmmaker Nick Berardini's subject is the Taser, the high-voltage stun gun that has been heavily marketed by entrepreneurial brothers Tom and Rick Smith to law...