Interesting fact is that according to some internal investigation, most of the officers who involved with "TASER abuse" cases, are the one who refused to be tased at TASER training course.
FYI for the outsider, most police departments require their officers to pass the TASER training course, if they want to carry a TASER in the field. I think that's a great policy. However, in the training course, there is section where trainees would volunteer to be tased. Although the instructor highly recommends that, not all trainees would volunteer for the experience. And it happens that, those that didn't volunteer are the one most often end up abusing the use of TASER.
I can tell you from my personal experience, once you have been tased, you will never use the TASER lightly. It is a extremely painful experience. You would definitely think twice before using it on someone.
To regroup, TASER no doubt is a great product which can save life in many situations. There are profession training courses in place to educate the user. Why can't the department require the officer to be tased just like they require them to be spray before carrying a pepper spray?
The problem is not the product, it is the user. We need to focus on regulation on the training requirement and use, not a debate on the product. Anything can be lethal when it is use inappropriately and excessively.