The obvious case that I am most familiar with, which is a leading cause for claiming amnesty by many groups, is the case of Gary Graham. There was one eyewitness to him running out of the crime scene, and she has never waivered in her claim. The murder was part of a week long crime spree by Graham in which he raped and shot numerous other people, leaving many for dead.
Graham even said, when he was being escorted from the court room following his conviction, that next time, he wouldn't leave any witnesses. This was heard and reported by the bailiff escorting him.
He even bragged to his victims which lived that he had killed other people.
When you have 5 or 6 people, all witnessing different aspects of his criminal acts and attempts at murder within one week, and then a woman who is absolutely certain that she saw him running from the crime scene of the murder, that, to me, is absolute proof. Yet, there were so many activists who were rallying to his side trying to get him out of jail and calling his execution a lynching; a hate crime.
There is, in my opinion, absolute proof that John Couey kidnapped, raped, and murdered Jessica Lynch, yet his confession was thrown out on a technicality. If he escapes any penalty for his crimes based on his confession being thrown out, who is justice served to?
When you catch someone on camera kidnapping a child, and a few days later, that child turns up dead, that to me is ample proof that the person is guilty of murder.
A little common sense can go a long way.