During the 1990s, I was acquainted with a woman who helped with blood donation drives. She said that there was sometimes a little difficulty in that area with getting enough donors. She said that blood was not allowed from anyone who had ever had sex with anyone else who had ever abused drugs intravenously. It’s likely that the same problem from drug abuse is far more widespread now.
That is what dedicated donors can accomplish when properly supported by blood drive organizers. They freely give their blood so others may live.