Even better idea: allow people to get paid for kidney, liver, and marrow donation. The insane prudishness and moralizing we have around the normal concept of getting paid for donations results in a lot of death and suffering. The USA is the source of 70% of the world’s blood plasma, vital for everything from battlefield medicine to critical pharmaceuticals, all because we allow people to get paid for it. The net good of allowing sales of liver, kidney, and marrow so drastically outweighs the negative.