"Innocent until proven guilty" is the law of the land. But there's a reason to keep that statement in quotes.
Society at large has a tendency to assume some degree of guilt whenever a person is arrested.
Mark Godsey spent his career working to put guilty people behind bars, and seriously doubting that any innocent people ended up there. Then he reluctantly ran the Kentucky Innocence Project. It changed his life.
Godsey writes about what he has learned in Blind Injustice: A Former Prosecutor Exposes the Psychology and Politics of Wrongful Convictions. The author visits with many case studies.