Either way, i concider this kinda retarded.. There is 'realism in games' and 'taking the piss' seriously, this is taking the piss.
Science out the way, if this has a potential chance of being harmful, in ANY way, shape or form, it shouldn't be sold.
Prolonged exposure to even the mildest of shock can be potentially dangerous.. allmost like stabbing yourself with a pin (You don't really notice one or 2 pricks, but when you have been stabbing yourself for hours, and there are thousands of holes on you.. well.. yea..)
Games nowadays give a good impression that you are being shot, and tbh, i'm gonna be sticking with that