I hate this whole "It's not non-lethal" movement for a couple of things.
First, the Taser has never been a proven cause of death in anyone. There have been a few MEs that have ruled it was the cause, but never actually proved it and instead used the "Well, it wasn't this or this or this, so it had to have been the Taser", which is why some courts have told MEs they can't do that.
And hell, in studies, the VAST majority of people (as in 99.7%) have had NO serious things happen. The other 0.3%? Rarities with conditions that happened... maybe the Taser precipitated events, but never deemed the cause. But hey, 99.&% is a pretty damn good number in my book... how many other things have that good of a "Bad things wont happen" percentage? You don't even have that just by driving down your residential street...
Second, the very definition of "Non-lethal" by way of the US DoDs definition, which is the one that matters, is something that is not intended to kill, not something that can't kill.