We've had that argument before on this site and I'm still not completely happy with the answer. It was in reference to Maul using a lightsaber when he is not a Jedi (former Jedi, etc.). I think the decision was that, because he was a Sith apprentice, he could still wield one. However, Grievous is a robot (android, whatever), so how do you justify that one. He's not a living being or anything like that. I dunno. I so 'fused.
