"Pam - gardengal" wrote in message

(snip) the American method of
processing bone meal differs from the European in that it involves both
heat
and solvent treatments, effectively destroying any potential pathogens.

The protection against BSE in your example is the fact that there is not yet
any example of BSE having been found in the US. How the Blood and Bone is
made in the US is irrelevant as there is no current treatment known to
destroy the prions that cause BSE