With no effective filtering they would get higher levels of toxins only if they had lower levels to begin with, or visa versa. The transfusion would tend to rev

With no effective filtering they would get higher levels of toxins only if they had lower levels to begin with, or visa versa. The transfusion would tend to revert their plastic levels toward the mean. That's not a bad compromise compared to the toxic effect of so many medicines that we tolerate when treating something worse.