Who Is Yvonne 'Missy' Woods? Ex-Colorado DNA Analyst Jailed for 10 Years After Mishandling 1,045 Criminal Cases

Yvonne 'Missy' Woods, a former Colorado Bureau of Investigation DNA analyst, has been jailed for 10 years after misconduct linked to her work triggered reviews in 1,045 criminal cases, including murder, sexual assault and robbery investigations.

The figure does not mean that every case involved deliberate data manipulation or that every conviction linked to her work is unsafe.

Woods, 66, was sentenced on 8 September by Jefferson County District Judge Andrew Poland in Golden, Colorado. Her guilty plea and sentencing resolve the criminal prosecution against her, but reviews and legal challenges involving cases connected to her laboratory work continue.

Who Is Yvonne 'Missy' Woods?

Woods worked for 29 years as a forensic DNA analyst at the Colorado Bureau of Investigation, known as the CBI. Her role included analysing biological evidence and recording laboratory findings used by police, prosecutors, defence lawyers and courts.

She left the CBI in 2023 after being placed on leave as concerns about her work were examined. The investigation began after an intern found missing information in a case Woods had handled in 2018.

The CBI's review identified anomalies or problems in 1,045 criminal cases associated with Woods' work. It included altered evidence-item data in 156 cases, changes to quality-control samples on 520 occasions, incomplete documentation in 233 cases, 106 policy breaches and 30 cases where reported results conflicted with laboratory notes.

Investigators also concluded that Woods intentionally changed data 227 times, although an individual act could affect more than one criminal case. The findings illustrate why the total number of affected files should not be treated as a count of separate proven acts of misconduct.

Why Was Missy Woods Sentenced?

Woods pleaded guilty in June to cybercrime, perjury, forgery and attempting to influence a public servant. She faced a sentencing range of eight to 16 years on the cybercrime count before Judge Poland imposed a 10-year prison term.

Dozens of other charges were dismissed under the plea agreement. The sentences imposed on the other offences run concurrently with the 10-year term.

Prosecutors alleged that Woods manipulated data to conceal problems in her testing, deleted material showing unresolved testing issues and failed to properly document her work.

Reporting on the case also said Woods told investigators that she had changed data to complete cases more quickly. Associated Press reporting detailed the sentence and the continuing impact on Colorado criminal cases.

At sentencing, Woods apologised for her conduct. 'For many years I was entrusted with evidence that could have profound consequences for defendants, victims, families and the courts. I failed that responsibility. I am deeply sorry for that failure,' she told the court.

What Happens to the Affected Cases?

The review of cases associated with Woods' DNA work does not automatically overturn convictions or establish that defendants are innocent. Prosecutors, defence lawyers and judges must assess whether any irregularity was material to the evidence, a guilty plea, a trial or a sentence in each case.

One case has already resulted in a vacated conviction.

Michael Clark's 2012 murder conviction for the 1994 killing of Marty Grisham was vacated in 2025 after prosecutors reviewed independent DNA testing and other issues, including concerns about Woods' work.

Clark was released from prison after the conviction was vacated. Prosecutors said they would assess whether to pursue a retrial, rather than confirming that a new trial would definitely take place.

In at least two homicide cases, defendants received lesser outcomes through plea agreements because prosecutors were concerned Woods' involvement could weaken the cases at trial. Other convictions connected to her work have been challenged in Colorado courts.

CBI Response and Wider Cost

State officials have estimated that the response to Woods' misconduct could ultimately cost more than $11 million (about £8.1 million). That projected sum covers the extensive review of past casework, legal proceedings and laboratory changes rather than money already spent.

The CBI has said it is working to reform its laboratories and restore confidence in its forensic work. Agency director Armando Saldate said Woods' actions did not define the wider organisation or the staff who continued to work 'with integrity'.

'The actions of one individual never define this organisation, and they do not define the dedicated public servants who continued showing up every day with integrity,' Saldate said.

Woods' sentencing resolves the criminal prosecution that led to her four guilty pleas, but the wider legal fallout remains unresolved. Courts and lawyers will continue to examine whether issues found in her DNA casework affected individual outcomes.