[Slar]

I was thinking MRI and/or Defibrillator.

I'd say the Taser charge is to low power on a standard shot, although if you could hand-place the electrodes properly, it would still have a chance.

For the Defibrillator, just a standard shock wouldn't work. Again, place the electrodes so that you hit pretty much the entire body at once.

The MRI? Just slide the victim in and turn it on.

I'd let someone get away with using other EMF, if they had more than one source, and could surround the body with a strong field. Better hope they have no pins, plates, or fillings...