The North Carolina justice system shook [on August 18] as an audit commissioned by state Attorney General Roy Cooper revealed that the State Bureau of Investigation withheld or distorted evidence in more than 200 cases at the expense of potentially innocent men and women. The full impact of the disclosure will reverberate for years to come as prosecutors and defense attorneys re-examine cases as much as two decades old to figure out whether these errors robbed defendants of justice. Some of the injustices can be addressed as attorneys bring old cases back to court. For others, it's too late. Three of the defendants in [corrupt] cases have been executed. Two former FBI agents, Chris Swecker and Mike Wolf, examined more than 15,000 cases at the invitation of Cooper, a Democrat who has been attorney general since 2001. The exoneration of Greg Taylor, a Wake County man imprisoned 17 years for a murder he didn't commit, prompted the review. SBI analyst Duane Deaver admitted in February that he failed to report tests indicating a substance on Taylor's SUV was not blood. Swecker's findings, he said, signal potential violations of the U.S. Constitution and North Carolina laws by withholding information favorable to defendants.