>if they are really innocent, then there is a good chance they will be able to prove it long before 30 years has elapsed.
Not really. The burden of proving your innocence is huge. You are in jail, no income, no money to pay for tests and investigators. Even if you show the prosecutors evidence was wrong, that does not prove your innocence. There is a case in TX where the blood type of semen matched and the man was convicted. DNA tests showed it was not a match. Oh well, that did not prove that he was not part of a group that did the crime, and he was not wearing a condom when he did it. Even though the prosecutor never asserted that a group did the crime at trial.
Once you are in jail, innocent or not, you pretty much stay in jail.
Life would be so much easier if we could just look at the source code. -- Dave Olson