In the 1970s, an American engineer Jack Cover designed a new experimental stun gun. He called it a Taser. But the device only really became popular when it started to be used by US law enforcement agencies. The Los Angeles Police Department were among the first to use the device. Retired police Captain Greg Meyer was then the young officer given the task of evaluating non-lethal weapons for the LAPD. He tells Alex Last about the origins of the Taser and its dramatic impact on the streets.

Photo: Jack Cover with an early version of his Taser. The gun has a flashlight atop and below are two cartridges each containing two darts which can be fired a distance of 15 feet with a stunning 50,000-volt shock.