Our entire nation is under a cloud created by the pharmaceutical corps. No wonder anything that goes against the mainstream is ridiculed. Clinical trials are not going to happen with zappers because they DO work. Read the testimonials of folks who have used them starting with mine. Colds relieved 7 times this year, toothe infections stopped several times, female infections stopped several times, itching for years has stopped completely in feet and anal area at night( a sure sign of parasites). Don't expect to get any positive responses from anyone in the medical field concerning zappers. Don't expect any positive responses on zappers except for the folks who use them. This website will help you understand more.