As we fade we still do studies with people but only from the scriptures.
One study asked about the Blood, so we should the revelant scriptures and asked how she felt about transfusions.
She said that "nothing loses it's life when you receive blood so it is fine in her conscience"
Love it!
The scriptures clearly show that the blood being poured out was to show respect that something lost it's life.
Maybe you can ask a witness, why it is ok to receive an organ from someone who has passed away BUT not ok to receive blood from a live person?