The idea of a false confession never seems to gain enough traction to cause real changes to the criminal justice system because most will never believe that an innocent person would confess. John Schwartz's New York Times Article describes the latest research:
But more than 40 others have given confessions since 1976 that DNA evidence later showed were false, according to records compiled by Brandon L. Garrett, a professor at theUniversity of Virginia School of Law. Experts have long known that some kinds of people — including the mentally impaired, the mentally ill, the young and the easily led — are the likeliest to be induced to confess. There are also people like Mr. Lowery, who says he was just pressed beyond endurance by persistent interrogators.A jury is looking for details in a confession that make it seem that only a guilty person could have known them.
Professor Garrett said he was surprised by the complexity of the confessions he studied. “I expected, and think people intuitively think, that a false confession would look flimsy,” like someone saying simply, “I did it,” he said.The hallmark of the false confession is "contamination":
Instead, he said, “almost all of these confessions looked uncannily reliable,” rich in telling detail that almost inevitably had to come from the police. “I had known that in a couple of these cases, contamination could have occurred,” he said, using a term in police circles for introducing facts into the interrogation process. “I didn’t expect to see that almost all of them had been contaminated.”