It really makes you wonder what other weapons they have that we don't know about.
In a purely technical ponderance, I wonder if it's possible to design a stun gun that would inflict death by either increasing the current and voltage, or if a specific signal could be sent to the heart that would induce an arrhythmia. Basically the opposite of a defibrillator. A biotech maintenance guy told me that if you receive a shock when your heart is in a critical phase of the complex, it can cause it to shut…
Defib is for patients with hearts that are beating incorrectly - and now are mostly automated.
Heart stopped and zapped with electricity makes for better movies though!