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You're probably right. One thing that sticks in my mind is him pointing out something like "Calcium is alkaline, so it will make your blood alkaline...use my home blood pH test kit to measure your blood pH and see if you need my treatment...if the test shows red, your blood is acidic." How gullible does he think people are?
And the reason he gave for the tax thing was that the doctors in America are selling patients time-buying drugs to treat their cancer, but are "Not educated about nutrition, so they don't realise the benefit of coral calcium." The whole thing seems illegal, or at least borderline.