Zapping cancer is a theory put forth by Dr. Hulda Clark . Her concept is that cancer, as well as other diseases, are the result of parasites. While I'm not convinced her theory is accurate, Dr. Rife developed the Rife Machine in the 1920' - 1930's that had a success rate of 97%. Both machines function along the same lines i.e, viruses can be destroyed thru electrical current. Don't know how refined the "zapper" is compared to the Rife Machine. Worth checking out.