The DNA exonerations of the past 20 years have heightened awareness of the problem of wrongful convictions. As the number of exonerations expands, and increasingly includes exonerations in cases with no DNA evidence, just what counts as an "exoneration," and who can legitimately claim to be "innocent," becomes increasingly important and controversial. The definitions are important for research and policy reasons, for they define the pool of cases that can be studied to learn about…