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.

Missy Woods retired from CBI in lieu of termination in late 2023 after the agency discovered widespread problems in her work.

A former CBI DNA analyst was criminally charged for over a year after the agency learned about mishandled or manipulated evidence. Yvonne "Missy" Woods faces over 100 separate charges related to over 1,

JEFFERSON COUNTY, Colo. — A former DNA analyst for the Colorado Bureau of Investigation who's accused of manipulating data in more than 800 cases over her 29-year career now faces more than 100 charges, according to court records obtained by 9NEWS Investigates.

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 analyst was criminally charged for over a year after the agency learned about mishandled or manipulated evidence. Yvonne "Missy" Woods faces over 100 separate charges related to over 1,