Leviticus 11:39-40 “Now in case any beast that is YOURS for food should die, he who touches its dead body will be unclean until the evening. And he who eats any of its dead body will wash his garments, and he must be unclean until the evening; and he who carries off its dead body will wash his garments, and he must be unclean until the evening ”.
Here the bible was talking to the average Israelite under Mosaic Law and bible mentions the eating of the dead un-bled animal as Ho Hum no big deal .
So it is all Bull shit as far as the Society's biblical claims against blood transfusions
Insight On the Scriptures Vol 1 pages 345, paragraph 6
“At Deuteronomy 14:21 allowances was made for selling to an alien resident or a foreigner an animal that had died of itself or that had been torn by a beast. Thus a distinction was made between the blood of such animals and that of animals that a person slaughtered for food. {Compare Le 17:14-16} The Israelites, as well as alien residents who took up true worship and came under the Law covenant, were obligated to live up to the lofty requirements of that Law. People of all nations were bound by the requirement at Gen 9:3,4 but those under the Law were held by God to a higher standard in adhering to that requirement than were foreigners and alien residents who had not became worshipers of Jehovah.” Notice those under the Law were held by God to a higher standard regards blood.