Attorney Elliot Slosar, who represents Cooper, said the letter was not an outright denial. Still, Slosar described it as a delay tactic that has the potential to prolong Cooper's quest to clear his name for several years. Slosar said it's unclear whether they will be allowed to file another post-conviction petition after the original was withdrawn. Even if they overcome that hurdle, Slosar said, prosecutors may argue the new evidence is too old to meet the requirement of being new.