In today's Spokesman Review we have an article concerning a bulletin issued by Taser International in which they advise
police agencies across the nation to avoid aiming the devices at a suspect’s chest. The Arizona-based company says such action poses an “extremely low” risk of an “adverse cardiac event.”
This seems disingenuous. If it's an extremely low risk, are police officers going to think "This might be the one adverse cardiac event" or "Low risk so it's not going to happen to me"?
Regardless, you don't have to look far to find multiple adverse events when it comes to Taser use. And in too many lethal and non-lethal cases, the Taser is used when less force will do the job.
I find it interesting that you can give a similar warning about firearms. Aiming at the chest can lead to an adverse fatal event.