I am certain that that is not Dr. Clark's page. There are many disreputable companies that try to give you that impression.
>- i'm a little skeptical about the zappers in general too
So was I 17 years ago. Changed my mind 10 years ago when I tried one. It is cheap zappers and cheaply made zappers that give zappers a bad name.
The is a booklet, " parasite Zapping and the Zapper" for $9.95 plus postage that will provide a good education on the topic, including how to zap to get the best results, what not to do, possible problems, and things to watch for.