@oralloy,
I rarely agree with Oralloy, but he has not only his ethics on the side of testing this evidence, he has the core ethos of the American system of justice, which holds that a man is considered innocent until proven guilty. If the state is blocking this testing, there is a good basis to assume that they have something to hide. Even were that not the case, the core ethos of American justice cries out for this test to assure his guilt or innocence.
I agree completely with Izzy, Bill has backed himself into a corner, and would rather see a man executed than admit that he may be wrong.