It appears that William Petersen (Gil Grissom) wants to bring his character out of the spotlight. Apparently he doesn't like all the spin-offs of the show and feels that he should just continue producing the show instead.
He is CSI, without him the show will die.
The Jehovah's have always hated blood transfusions, a friend of mine goes out with a Jehovah but I've never met him (useless fact).
I'm not too sure on why they do but I think it's because they feel it's more of an organ transplant and they really don't like those.
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