Here’s a hint at how often: Nationwide, 1,342 people have been exonerated, often after spending decades in jail, according to the National Registry of Exonerations, a joint effort of the University of Michigan and Northwestern University law schools. In Virginia, 36 people have been cleared of committing heinous crimes, 17 of those thanks to DNA evidence. “That’s not even the tip of the iceberg,” said Harding, who went on to read UVA law professor Brandon Garrett’s “Convicting the Innocent: Where Criminal Prosecutions Go Wrong,” an examination of the f...