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.
Police departments across Canada began banning use of Tasers by their officers after the report found that Tasers deliver more power than the manufacturer says is possible.
It is unknown if U.S. police departments will follow suit.
The study includes a medical analysis that concluded someone shot with a Taser could face as high as a 50 percent chance of cardiac arrest.
Sold as 'non-lethal,' Tasers killed 400 since 2001
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