Steve's post led me to do a bit of research in this area.  Have a look at this:
http://www.epa.gov/fedrgstr/EPA-PEST/2007/September/Day-21/p18591.htm

I am beginning to feel lucky that all been doing is selling 99997 silver wire 
(presumably to be used in manufacturing jewelry).
This is really nothing to laugh about.  Our government has become so large and 
powerful that it can do whatever it wants.