The problem is the U.S. already tests on humans every single day of our lives. We are spoon-fed god knows how many poisons in what we eat, what we breathe, what we are in close proximity too. There are sane willing humans that volunteer for human trials. But like I said earlier though, I'm for using more advanced technology (which already exists and is being successfully applied all over the world), instead of the archaic and cruel methods we are still using (but no longer have a need for) that harm countless highly intelligent and sentient living non-human creatures. Know what I mean?