My understanding was that the meat-packing process in the US involves a butchering method that results in more fecal matter contamination, posing the risk of salmonella, which necessitates the wash. Those bacteria occur naturally, so you can't avoid that without being careful with butchering, which is probably what the EU standards require. But I doubt the big meat conglomerates like Tyson will want any hit to productivity, and they would fight a change every step of the way.