Parazapper can't show any proof, and it's not because of any legal reason. Clark zappers never have and never will do anything but irritate and piss off worms. Parazapper deceptively uses the word "parasite". He knows people think "worms" whereas he means to say "parasitic microbes". And for his information the feds can use thing he has ever said or wrote making any type of claim that his devices treat diseases (such as parasitic infections) to easily put him in prison for selling medical devices that aren't FDA approved. I know the subject better than anyone because I did my own legal research on the subject for almost a year while I was fighting for my own defense against the feds.