It took decades for death row inmate Richard Glossip to convince Oklahomans and, later, the U.S. Supreme Court that he deserved a new trial. Glossip is just one of many inmates who say they faced convictions for crimes they did not commit. Read about enough of these cases, and you’ll be asking, “Is innocence enough?” For the wrongfully convicted, tearful reunions and proclamations of justice from the courthouse steps only come after an arduous exoneration process paved with years of litigatio...