That's the idiocy of most law. Why on earth wouldn't a government allow nature to take its course within health guidelines?? I could be wrong, but I've heard that embalming is required even if the plan is to cremate the body!
I'm pretty sure that if there was no foul play/autopsy and it is perfromed under a time frame you'll get a clean cremation. If in some cases family and friends need to make arrangements from afar to travel for the services there is an embalming.
But for a US burial I hadn't heard of non embalming. But I could be wrong on all fronts here.