Tasers do not usually kill... [LINK]
Put another way, Tasers sometimes do kill.
That's a long way from the old lie that Tasers were inherently incapable of ever causing or contributing to death.
It shouldn't be such a great mystery when some people react to taser hits by dying.
Taser International may play word games, but the fact remains that Tasers can and do cause or contribute to death. Therefore, their use must be tightly regulated.