Former Colorado State Crime Lab Scientist Sentenced to 10 Years in Prison for Widespread DNA Tampering

A former forensic scientist with the Colorado Bureau of Investigation has been ordered to serve a decade behind bars following an extensive scandal involving the manipulation of DNA evidence that threw hundreds of criminal convictions across the state into question.

State District Judge Andrew Poland delivered the 10-year prison sentence to Yvonne "Missy" Woods on Tuesday during a hearing at the Jefferson County Courthouse in Golden, Colorado. Woods had faced a potential penalty ranging from eight to 16 years in prison under the terms of a negotiated resolution.

The sentencing marks a critical milestone in a case that has rattled Colorado’s judicial and forensic science communities. In June, Woods formally pleaded guilty to multiple felony offenses, including perjury, attempting to influence a public servant, forgery, and committing a cybercrime. As part of the plea agreement reached with prosecutors, dozens of additional criminal charges against her were dismissed.

The criminal case against Woods centered on systemic misconduct uncovered within her laboratory work. State authorities revealed that the veteran scientist had repeatedly altered testing data to hide evidence tampering, deleted records that demonstrated her failure to troubleshoot problems during the testing sequence, and neglected to properly document required procedures in official case files.

According to an arrest affidavit, Woods admitted to investigators at one point that her decision to modify data was driven by a desire to complete case evaluations more rapidly. The manipulation spanned a substantial portion of her decades-long tenure at the state crime laboratory, which ended with her formal resignation in 2023.

The systemic irregularities remained undetected for years until September 2023, when an intern working at the bureau noticed missing details in a case file that Woods had processed back in 2018. That initial discovery quickly triggered a comprehensive internal and criminal investigation into the entirety of her analytical work.

During Tuesday's proceedings, an emotional Woods wept openly while addressing the court alongside her defense attorneys, Lindsay Brown and Tom Ward. She expressed remorse for her actions while watching video evidence and providing a formal statement to the judge, acknowledging that an apology could never fully rectify the damage she had inflicted on the legal system.

"For many years I was entrusted with evidence that could have profound consequences for defendants, victims, families and the courts," Woods told the court. "I failed that responsibility. I am deeply sorry for that failure."

Following the court's decision, Colorado Bureau of Investigation Director Armando Saldate issued a statement emphasizing the agency’s ongoing commitment to instituting comprehensive laboratory reforms and regaining public confidence. Saldate insisted that the wrongdoing was confined to Woods and did not reflect the agency as a whole.

"The actions of one individual never define this organization, and they do not define the dedicated public servants who continued showing up every day with integrity," Saldate stated in response to the sentencing.

The real-world consequences of Woods' fraudulent testing have created massive ripples throughout Colorado's criminal justice system. State authorities identified serious discrepancies in forensic evidence tied to numerous major offenses, including homicide investigations, sexual assault allegations, robbery proceedings, and other serious felony cases.

The compromised laboratory findings have already overturned major legal outcomes. In 2025, Michael Clark was released from prison after his legal team successfully demonstrated that the DNA evidence used to secure his murder conviction had been mishandled by Woods. Following the vacating of his conviction, prosecutors announced their intention to seek a retrial.

In addition to overturned convictions, the scandal severely impaired prosecutors' ability to take active cases to trial. In at least two separate homicide prosecutions, defendants were offered and accepted plea bargains with reduced penalties because prosecutors feared that Woods’ compromised involvement would make securing trial convictions impossible and result in acquittals.

Defense attorneys and prosecutors throughout Colorado are continuing to review hundreds of past cases handled by Woods, with numerous other convictions being actively contested in courtrooms across multiple jurisdictions.

The fallout has also raised sharp questions regarding oversight within the state's premier forensic laboratory. A Colorado Bureau of Investigation internal affairs report released in 2024 showed that concerns regarding Woods' testing practices had emerged more than a decade prior. The report documented that a co-worker had raised red flags regarding her testing methods as early as 2014, and Woods was briefly removed from processing DNA evidence in 2018 following data manipulation accusations.

Beyond the severe human and legal toll, the state is facing an enormous financial burden to resolve the crisis. State officials have estimated that the overall cost of auditing contaminated case files, conducting independent reviews, and retesting compromised forensic evidence could ultimately exceed $11 million.