Schaefer says they notified Colorado district attorneys and retested DNA in the cases where DAs requested it -- just 14 so far. He admits CBI has not notified defense attorneys, victims or defendants, some of whom were convicted and sent to prison on the basis of the evidence.

A former Colorado Bureau of Investigation DNA scientist appeared in court Thursday to face criminal charges over data tampering that authorities said raises questions about the validity of more than 500 cases.