An intern stumbled onto an anomaly in a sex assault kit, and what unraveled next exposed one of the worst forensic science betrayals in American criminal justice history.
Story Snapshot
- Yvonne “Missy” Woods, a Colorado Bureau of Investigation (CBI) DNA analyst for 29 years, pleaded guilty to four felony counts in June 2026 after manipulating DNA evidence for at least 15 years.
- Her actions tainted more than 500 criminal cases, including sexual assault cases where she falsely reported no male DNA was present when it actually was.
- The scandal has cost Colorado taxpayers more than $11 million to address.
- An intern found the first red flag in September 2023 — Woods had passed undetected through years of internal reviews before that moment.
How a 29-Year Career Became a Crime Scene
Woods worked as a DNA analyst at the Colorado Bureau of Investigation (CBI) from the early 1990s until she resigned in 2023. She was trusted. She was experienced.
And according to prosecutors, she spent at least 15 years quietly corrupting the science that juries, judges, and victims relied on to deliver justice.
In September 2023, an intern doing a research project on sex assault kits noticed something was off. That single anomaly cracked open a scandal no one saw coming.
JUST IN: Disgraced former Colorado Bureau of Investigation scientist Yvonne “Missy” Woods pleaded guilty to four felonies, closing a chapter in a years-long DNA testing scandal that continues to reverberate through the state’s criminal justice system. https://t.co/VKQwSwVrEr
— The Denver Post (@denverpost) June 23, 2026
The CBI launched an internal review and found Woods had manipulated data, omitted facts from criminal justice records, and tampered with DNA testing records. [2]
Investigators detailed in a 35-page arrest affidavit that she intentionally left DNA samples out of tests, deleted data to avoid extra testing steps, and ran samples repeatedly until results matched what she wanted. [3]
In multiple sexual assault cases, she reported no male DNA was found, when male DNA was actually present.
The Charges She Faced and the Deal She Took
Prosecutors hit Woods with 102 felony charges covering actions from 2008 to 2023. [2] The charges included 52 counts of forgery, 48 counts of attempting to influence a public servant, 1 count of perjury, and 1 count of cybercrime.
She initially pleaded not guilty to all of them in February 2026. Then, in June 2026, she changed course. Woods pleaded guilty to four felony counts — cybercrime, perjury, attempting to influence a public servant, and forgery — and prosecutors dropped the remaining 98 counts. [1]
Some will read the dismissal of 98 counts as a sign the prosecution’s broader case was weak. That reading doesn’t hold up well against the facts. Plea agreements routinely trade charge counts for certainty of conviction.
Four felony guilty pleas from a career forensic scientist — on the record, under oath — is a serious outcome. The dismissed counts don’t erase what she admitted to doing.
What She Did and Did Not Do — A Critical Distinction
The CBI made an important clarification after its internal review. Woods did not fabricate DNA matches from scratch or plant false profiles. Her affirmative DNA matches — cases where she identified a suspect — may still be reliable. [14]
The cases most directly poisoned are the ones where she reported negative results. Cases where she said no DNA was found. Cases where she said no male contributor was present. Those are the verdicts and decisions now in question.
FORMER CBI DNA ANALYST MISSY WOODS PLEADS GUILTY, AVOIDS TRIAL ON MORE THAN 100 FELONY COUNTS
JEFFERSON COUNTY, Colo. — Former Colorado Bureau of Investigation forensic scientist Yvonne “Missy” Woods pleaded guilty Tuesday to four criminal counts, avoiding a trial that had been…
— D.M.G. (@DWildcard303007) June 23, 2026
That distinction matters enormously for the people whose cases she touched. A rapist who was identified by her DNA work may still have been correctly identified.
But a victim who was told there was no DNA evidence — and whose case went nowhere as a result — may have been failed by a lie. That is the most troubling part of this story, and it deserves far more attention than it has received.
This Is Not an Isolated Failure — It Is a System Problem
The Innocence Project reports that misapplied forensic science contributed to more than half of all wrongful convictions in their database and nearly 25% of all wrongful convictions since 1989. [22]
Woods is not a lone bad actor who slipped through the cracks. She is the predictable product of a system with too little oversight, too much backlog pressure, and voluntary accreditation standards that academic research has called a failure. [19]
When labs are under pressure to clear cases fast, corners get cut — and the people most likely to pay the price are crime victims whose negative results get buried.
The $11 Million Bill Taxpayers Are Paying
Addressing Woods’ misconduct has cost more than $11 million so far. [2] That number covers case reviews, legal proceedings, and the enormous task of sorting through more than 500 affected cases to determine which can still stand and which cannot.
Colorado’s justice system is now spending years and millions of dollars cleaning up what one analyst did over 15 years — largely because no independent oversight caught it sooner.
The intern who found the anomaly in 2023 did more to protect the integrity of Colorado’s courts than the oversight systems that were supposed to do exactly that.
Sources:
[1] Web – Former Colorado analyst pleads guilty in DNA testing scandal
[2] Web – Colorado DNA analyst appears on forgery charges as validity of …
[3] Web – Former Colorado DNA analyst accused of manipulating data pleads …
[14] Web – How Forensic Misconduct Can Unravel a Conviction
[19] Web – [PDF] THE CRIMES OF CRIME LABS – Hofstra Law
[22] Web – Misapplication of Forensic Science – Innocence Project
