I don't think that you will find any legal document in the WT publications that state a penalty for taking a blood transfusion, which obsolves the WT from any legal issues.
Actually, they do have written down that if you accept blood, you can and will be disfellowshipped:
"Questions from Readers:
"In view of the seriousness of taking blood into the human system by a transfusion, would violation of the Holy Scriptures in this regard subject the dedicated, baptized receiver of blood transfusion to being disfellowshipped from the Christian congregation?" "The inspired Holy Scriptures answer yes."---Watchtower, January 15, 1961, p. 63
In addition to the immediate punishment, they also brainwash the R&F into believing that by accepting a transfusion, you've jeapordized your or your kid's chance at everlasting life:
"They know that if they violate God's law on blood and the child dies in the process, they have endangered that child's opportunity for everlasting life in God's new world......it may result in the immediate and very temporary prolongation of life, but that at the cost of eternal life for a dedicated Christian."----- BLOOD, MEDICINE AND THE LAW OF GOD
So basically, they terrify the followers with the threat of losing all your JW family and friends now, plus you'll have to contend with Jehovah murdering you and/or your child at Armageddon if you accept a transfusion right now. With that sort of emotional blackmail hanging over your head life the Sword of Damacles, is it any wonder that to some Witnesses, an 'honorable death' is preferable? Like I've said before, if the Governing Body members were all charged with Assisted Suicide whenever a Witness dies due to the blood doctrine, they'd change their minds pretty damn quick.
Hmmmm.....the guy looks uncannily like Boss Hogg..........
I'm goin' ta heaven.....heaven.....in Memphis Tennessee....