Sold as 'non-lethal,' Tasers killed 400 since 2001

They are marketed as non-lethal weapons that allow police to capture suspects or criminals without causing any permanent harm.
Former New York Mayor Rudolph Giuliani and businessman Bernard Kerik made millions selling the idea to police departments across the country.
But Tasers have killed more than 400 people since 2001, according to a new study commissioned by the Canadian Broadcasting Corp.