I assume you're cool with this as long as this innocent person isn't your child, wife or yourself? Right?
And how is society protected by sending an innocent person to prison for a crime that someone else, running free, committed?
You might want to think this through.
In a civilized society under no circumstance, anytime, anywhere, should and innocent person ever be sent to prison. Ever.
And just how will that be accomplished, Pollyana?
The only way to be absolutely sure of that, "Ever", is to not send 99% probably guilty people to prison, because of that smidgen of doubt. And will you take responsibility, under this kind of system, for the "child, wife, or yourself" that is harmed or killed by the released criminal?
I know, it makes you a "good person" to assert that no innocent person should "ever" go to prison, but should any innocent person be harmed by someone released in error in order to ensure your idealistic vision?