You see, sevral of my best friends are deeply religus. And therefore they have to live in certan ways.
One of those being: Not taking blood transfusions.

• And we respect their religon, so we never give them blood transfusions.

But one of our friends is scared of getting DayZ because someone might be walking by, not knowing of his religion and give him a blood transfusion without his approval.

SO, the solvation:

In reality there is a card wich you can get called "No to blood". This card is goes on top of the medical recomendations (yes, even if the patient is dying).

So, maybe we could have a "No to blood" option wich makes you unable to give / recieve blood.

This would make the game harder for them, meaning they'd have to find saline bags or eat all the time, but it was their choise.