The issue here is particularly salient in the case of a natural substance. The potassium a country is going to import from us is the same potassium they are going to use out of their own supply if they have it, so it seems to me a fairly straightforward matter that potassium is potassium. That's what we would say to our trading partners--that our potassium is no more unsafe than theirs.
On September 21st, 2006. See this statement in context.