Canada seems to be having an abnormal number of fatalities compared to the US and EU. I doubt the devices are different, and I strongly doubt Canadians are all that different internally (even if we can't teach you to say "out" right :P ). That leaves how the tool is being used.

I've heard a couple of places that some of your Taser fatalities had multiple units shocking them at the same time. That just sounds like a bad idea, from a signals perspective.