No, they produce very low current, but lots of voltage.
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And sadly, they kill!
Most don't actually.
But there have been some. I just think people should take that into consideration if they use it.
Rarely, yes. Though overused, it's a good tool.High current would most certainly kill. High voltage, on the other hand, will hurt, make your muscles clench, etc, but not really harm you. There's a good article on stun guns on How Stuff Works.