I have no idea of how many people might be innocent who are in jail, but I remember a time when no one believed that anyone in jail could be innocent.
But DNA has proven that premise to be wrong.
And we all know, or should know, that not all policemen and DA's are honest in their pursuit of criminals.
They sometimes let the guilty go free because they are afraid of them, take the Martha Moxley case, for example.
Well, I think money goes along way in BUYING innocence in a court of law (in Moxley's case before it gets there). O.J. bought his innocence with an expensive crack team of attorneys, an inept prosecution and a hopelessly dumb, racist jury. Very sad ... and it happens all the time.
And even worse, they frequently go after those they know are NOT guilty, because they need a conviction. After all, if too many crimes went unsolved, people would start questioning why the police have so much power, and why they can't seem to solve crimes with the power they are given.