It would depend on how much pressure and coercion was applied by the government in the first place vs. now. That could easily offset the fading due to passage of time.Which way would you be thinking better, right after the incident or 20 years later?:shrug:
Even if I don't remember the incident clearly now, I'm quite sure I would remember thinking "Wow. I just put an innocent man on death row." That would be a hard burden to carry and I would jump at a chance to right a past wrong. I suppose this might work both ways though, and influence someone to lie now because their belief system changed.
The whole process just begs for some sort of serious revision, IMO.