In my Doctors surgery there was a woman who worked there who was a witness. She was adament that she would spill the beans on anyone who "did wrong"
Years later I met her after we had both left the Borg and she told me that there were so many child protection issues with the elders families that she became aware of that the elders told her to get another job.
She became very ill because of the stress and was basiclly told she was not fit to be in the congregation and she left.
If someone had a transfusion in this country then they could demand that the fact be kept quiet but if you had lots of visitors and a bag of blood hanging up by the bed someone would notice...
Tricky one as you might need to live and stay in the cong untill you could get out. Also I don't think you could be disfellowshipped as they would say that you had DA'ed yourself. (nice avoidence of responsibility by them I feel)