http://www.medpagetoday.com/Cardiology/Arrhythmias/tb/3333
Neil Osterweil
"Study found no evidence that electrical stun guns, Tasers, for example, were capable of inducing ventricular arrhythmias when used at standard voltages. This study was published as an abstract and presented as a poster at a conference. These data and conclusions should be considered to be preliminary as they have not yet been reviewed and published in a peer-reviewed publication."