This concept — an innocent person who is still found guilty and given the most severe sentence possible — is obviously not theoretical. Since the early 1970s, more than 150 people sentenced to death have been exonerated, according to the Death Penalty Information Center. Meanwhile, a record 125 people were exonerated in the United States last year, and six of those people had been sentenced to death, the National Registry of Exonerations said in its report.