First, what your friend was experiencing may have been anxiety and this does occur with a very small percentage of zapper users ( in my experience, less than 1 in 1000 users ).

That aside, it make a difference as to what the metal is that is used. In my book " parasite Zapping and the Zapper" available at http://www.paradevices.com
, I explain that stainless steel implants can have problems due to the nickel and chromium that is a part of the alloy. Both of these elements are known as tissue irritants, are electrically motile, and may cause cancer.

EEven stainless steel is only likely to have a problem if the current is passing directly through it or is strong in the immediate area. The places that are more likely to have problems are joint replacements and large pins in the major bones. However, in the case where the prosthesis is in the neck, located near nerves, any release nickel or chromium make cause an unexpected stimulus to the nervous system.

Implants made from titanium, however, do not appear to present any problems at all.

Some of the other metals discussed in the book are gold, silver, copper, and aluminum.