Yes, but I think you need to qualify that concern. If I may, I'll just give you some background.
The actual energy that reaches the heart is below the amount of energy that has been shown experimentally to induce ventricular fibrillation, in the main. Again, there's a possibility that if the darts happen to be in a location where the current traverses the heart, the energy would be higher.
That's something that's very important to understand. I know that these have been the findings experimentally: the amount of energy that actually gets to the heart is not enough to convert it. But the jury is still out on that one, I would have to say.