*sigh* If you're zapping right, it's not going to happen. Quit with the fear mongering, eh??
I've used them for 15 plus years CORRECTLY and NEVER once had anything like that happen. I think you don't know what you're talking about.
You also NEED the herbs to kill any in the digestive tract, just as Dr. Clark's PROTOCOL calls for(in the bowels is where the zapper MAY not reach), but NEVER THE HERBS by themselves.