Most of the blood is drained....that in the main veins and arteries...however, the tiny capillaries that carry blood through the meaty portions of the body and the organs is not drained, nor could it ever be totally excluded from body tissues....I was raised on a farm too.
Why do you divert into minutia? Do you think God didn’t know the difference? God said don’t eat the blood. That it was to be spilled on the ground. Now you’re questioning God?