Too funny, are you saying they should have looked for skin instead of internal body fluids? That would imply that you think that the foot bath would be removing the skin somehow? Of course not, they tested for internal substances normally removed from the liver and kidneys, but found none.
I don't mind that well meaning people are buying them if they understand that it is a placebo, but no one should be paying for sessions in an electrolysis unit. If you have access to one, try setting it up with all the salts etc but minus any human contact, ie, no feet etc, turn it on, and watch the water turn brown. Gee, maybe its leftover toxins from the previous user? No, its iron corroded from an electrode. Now try to figure out what the "filter" does and why it shows corrosion on the electrodes inside it. How is that a "filter", what is it "filtering out" that leaves the water brown? Oh maybe its putting something into the water? Now you're on the right track!