How about this? Are Jehovah's Witnesses allowed to eat the widely used E120 or Carmine that is made of insect blood. It is the whole insect including its blood that is used and if you crush a living Cochineal insect you will see its red blood color, I've seen that done on a program on BBC where they also refer to the red as the insect's blood. http://www.bbc.co.uk/programmes/b00tkzb3
And how about some fishes like smelt that are eaten without draining the blood? Do you know any other cases?
I would love to send this as a question to the GB.