For 29 years, Yvonne “Missy” Woods was a star analyst at the Colorado Bureau of Investigation. She testified in high-profile murder trials. She was trusted as the gold standard in DNA testing. Prosecutors built cases around her results. Juries convicted defendants on the strength of her reports.

Then, in September 2023, an intern doing a research project on sex assault kits found an anomaly in her work. What the subsequent investigation uncovered was one of the most extensive forensic misconduct cases in American criminal justice history: 102 felony charges, more than 1,000 affected cases, evidence deleted to avoid additional testing, sexual assault kits where she falsely reported no male DNA was present, and a 15-year trail of manipulated results from 2008 through 2023.

Her trial is scheduled to begin September 24, 2026, in Jefferson County, Colorado. She has pleaded not guilty.

The Woods case is a Colorado story. But its lessons are directly applicable in Texas and the mechanism for challenging a Texas conviction tainted by forensic misconduct is a specific statute: Texas Code of Criminal Procedure Chapter 64. This blog explains what happened, how it happened, and what Texas defendants and their families need to know about challenging forensic evidence after conviction.

 

The Missy Woods Timeline

A chronology of how the misconduct unfolded and what followed:

January 1994  Yvonne “Missy” Woods is hired by the Colorado Bureau of Investigation as a DNA forensic analyst. Over nearly three decades she becomes one of the agency’s most prominent experts, testifying in dozens of high-profile cases.

2008  CBI’s investigation later identifies this as the earliest date of alleged misconduct, though the full scope of her career’s work remains under review back to 1994.

September 2023  An intern conducting a research project on unsubmitted sex assault kits discovers anomalies in Woods’s past DNA work. CBI launches an internal investigation immediately.

October 3, 2023  Woods is placed on administrative leave while the internal investigation proceeds. CBI requests the South Dakota Division of Criminal Investigation conduct an independent criminal investigation, since the matter involves CBI’s own employee.

November 2023  Woods retires from CBI in lieu of termination. She performs no additional work for the agency.

November 2023  South Dakota DCI begins its formal criminal investigation.

February 26, 2024  CBI releases findings of its internal affairs investigation. Woods manipulated data in the DNA testing process, posting incomplete test results in some cases. CBI specifies: the investigation did not find that Woods falsified DNA matches or fabricated DNA profiles outright. She deviated from standard testing protocols and cut corners, omitting results. She admitted to deleting data in some cases to avoid additional testing steps. In multiple sexual assault cases, she falsely reported no male DNA was present when small amounts had been detected.

March–June 2024  Cases begin unraveling. In Boulder County, prosecutors agree to a plea deal in a triple homicide case after learning Woods manipulated data in the investigation, reducing the defendant’s sentence rather than risk a trial tainted by her involvement. A 1985 cold case in Douglas County is similarly resolved through a plea rather than trial. DA Corrie Caler: “You have to weigh him walking away with nothing versus at least some conviction, some accountability and some justice for the victim.”

August 2024  An attorney for a man serving a life sentence for murder files a motion to overturn his conviction based on the investigation into Woods.

August 2025  CBI’s identified affected case count rises to 1,045. The agency estimates the cost of misconduct-related retesting, reviews, and potential retrial expenses at over $11 million. A separate analyst at the Weld County Sheriff’s Northern Colorado Regional Forensic Laboratory is also referred for investigation after CBI’s audit process reveals similar anomalies.

September 2025  A judge vacates a conviction for first-degree murder in a 1994 case after the critical DNA evidence is retested. The defendant becomes eligible for a second trial.

January 21, 2025  The Jefferson County District Attorney’s Office files 102 felony charges against Woods: 52 counts of forgery, 48 counts of attempting to influence a public servant, one count of perjury, and one count of cybercrime, covering 58 separate instances of alleged misconduct. Woods turns herself in and is released on a $50,000 bond.

February 11, 2026  Woods appears for her third arraignment hearing in Jefferson County Court. She pleads not guilty to all 102 charges. Trial is set for September 24 through October 30, 2026.

Trial set: September 24, 2026  A five-week trial is scheduled before Jefferson County District Judge Andrew Poland. The case remains pending.

 

What She Actually Did: The Mechanics of the Misconduct

Understanding the Woods case requires understanding what she is alleged to have done and, equally important, what she is not alleged to have done. The distinction matters for how the misconduct affects the cases she worked.

What she allegedly did:  Omitted test results from official case files. Deleted data to avoid additional testing steps. Reported that no male DNA was present in sexual assault samples when small amounts had been detected. Tested samples repeatedly until results aligned with a desired outcome. Asked a colleague to delete file versions “because it’s a pain.”

What CBI says she did not do:  Fabricate DNA matches from whole cloth. Plant false profiles. The internal investigation found she did not falsify DNA identifications. She omitted results and cut corners which means her affirmative matches may still be reliable. But cases where she reported negative results (no DNA found, no male contributor detected) are the ones most directly tainted.

This distinction is critical for understanding the downstream impact. In sexual assault cases where Woods reported no male DNA, investigators may never have pursued DNA evidence further. A victim’s case may have been closed or declined for prosecution based on a false negative. In murder cases, evidence that might have identified an additional contributor was never surfaced. The cases most affected are the ones that ended where exculpatory evidence was suppressed, not where inculpatory evidence was manufactured.

 

Why This Happens: Systemic Vulnerabilities in Crime Lab Oversight

The question everyone asks about forensic misconduct cases is: how does it go on for so long? In Woods’ case, the answer involves several overlapping failures.

Accreditation is not the same as oversight.  Crime laboratories can be accredited (and CBI was) while individual analyst misconduct goes undetected. Accreditation evaluates whether a lab has the right policies, equipment, and procedures in place. It does not mean every analyst’s work is independently verified case by case. The Houston crime lab was operating under its own accreditation process while the systemic failures described above went undetected for years. Read more on this in our blog on lab accreditation.

Trusted analysts receive less scrutiny.  Woods was described as a “prosecutorial rock star.” Analysts who build a reputation for reliable work in high-profile cases become trusted. That trust can become a shield. The same deference that makes their courtroom testimony powerful also reduces the likelihood that supervisors will question their bench practices.

Case review is reactive, not proactive.  The misconduct came to light because of an intern’s project so it was a coincidence, not a systematic audit. CBI reviewed over 10,000 cases after the fact. There was no mechanism to detect deviations in real time across the years of Woods’s work.

Defendants have no independent access to lab data.  In most cases, the defense receives the analyst’s report. Not the raw data. Not the deleted files. Not the workflow logs showing what was tested and what was discarded. The structural information asymmetry between the prosecution’s forensic laboratory and the defense is the condition that allows misconduct to remain hidden.

 

The Texas Framework: Challenging Forensic Evidence After Conviction

Forensic misconduct of the kind alleged in the Woods case does not require a Colorado connection to be relevant to Texas defendants. Texas has its own crime laboratories, its own DNA analysts, and its own long history of convictions that rested on forensic science evidence. The lesson from the Woods case is structural: a trusted analyst in an accredited laboratory can manipulate evidence for years before anyone checks.

For a Texas defendant who has already been convicted in a case involving DNA evidence, there are several mechanisms for challenging the forensic basis of the conviction.

Texas Code of Criminal Procedure Chapter 64: Post-Conviction DNA Testing

Chapter 64 of the Texas Code of Criminal Procedure provides a specific statutory mechanism for a convicted person to request post-conviction DNA testing of evidence containing biological material. This is one of the most powerful post-conviction tools available in Texas and is directly applicable to cases where the original DNA testing may have been flawed, incomplete, or compromised.

To obtain Chapter 64 testing, the convicted person must show:

  • The evidence exists and is in a condition to be tested.
  • The evidence was secured in relation to the offense giving rise to the conviction.
  • Identity was or is an issue in the case.
  • A reasonable probability exists that the person would not have been convicted if exculpatory results had been obtained through DNA testing. This is the most contested element.
  • The testing is not being requested to unreasonably delay execution of the sentence.

The “reasonable probability” standard is the key. The Texas Court of Criminal Appeals has interpreted this to require a showing that the DNA results, if exculpatory, would have changed the outcome of the trial. In cases where DNA was a central element of the prosecution’s evidence, this standard is more readily satisfied. In cases where DNA was one of many pieces of evidence, the analysis is harder. A defense attorney pursuing Chapter 64 relief must evaluate not just whether the DNA result was wrong, but whether the correct result would have changed what the jury did.

What “Exculpatory” Means in the Forensic Misconduct Context

In a standard Chapter 64 case, the petitioner argues that retesting will show their DNA was not present on a piece of evidence. In a forensic misconduct case, the argument is more nuanced: the original analyst may have suppressed exculpatory results. If Woods’s counterpart at a Texas laboratory falsely reported no male DNA was present in a sexual assault case, and a true positive result would have identified a different contributor entirely, that suppressed result is exculpatory evidence whose existence was concealed.

This connects to the Brady doctrine. Under Brady v. Maryland, prosecutors have a constitutional obligation to disclose material exculpatory evidence. When that evidence is suppressed not by a prosecutor but by a forensic analyst (and the suppression is later discovered) the Brady framework may still apply depending on whether the analyst can be treated as a member of the “prosecution team” for Brady purposes. Texas courts have addressed this question in the context of police misconduct; the forensic lab context is an evolving area of law.

Texas Code of Criminal Procedure Art. 11.073: Faulty Science Writs

Chapter 64 addresses DNA specifically. Texas Code of Criminal Procedure Article 11.073 addresses the broader category of junk or unreliable science allowing a convicted person to seek a writ of habeas corpus based on a change in the scientific evidence that was relevant to the conviction. If the scientific evidence, if presented today, would be contradicted by current scientific understanding or would not have been admitted, the convicted person may be entitled to relief.

Article 11.073 was enacted specifically in response to arson conviction scandals in Texas where defendants were convicted based on now-discredited fire investigation methodology. It has since been applied to other forensic areas. Forensic DNA misconduct is precisely the category of case 11.073 was designed to address.

The Innocence Inquiry: Texas Statute and Practice

The Texas Legislature created the Tim Cole Advisory Panel on Wrongful Convictions and established post-conviction review mechanisms specifically to address wrongful convictions. The Texas Forensic Science Commission (created in 2005 in response to documented problems at the Houston Police Department crime lab) has authority to investigate complaints of professional negligence or misconduct in forensic science disciplines. A complaint about a Texas crime lab analyst can be filed with the Commission, which has investigative authority and can refer findings to licensing boards and other oversight bodies.

 

What the Woods Case Tells Us About Forensic Evidence at Trial

The Woods case matters at the trial level, not just the post-conviction level. For anyone currently facing criminal charges in Texas where DNA evidence is part of the prosecution’s case, the Woods timeline suggests several practices that should be standard in every case:

  • Demand the complete laboratory file, not just the report. The analyst’s report is the endpoint of a process. The raw data, instrument outputs, workflow logs, quality control records, and chain of custody documentation are the process. In Woods’s case, deleted files and omitted results would have been visible in the complete file but invisible in the summary report.
  • Request the analyst’s proficiency test records. Crime laboratory analysts are required to pass periodic proficiency tests. A pattern of errors on proficiency tests is a red flag. These records are discoverable.
  • Check whether your analyst has been the subject of any complaints, investigations, or disciplinary actions. The Texas Forensic Science Commission maintains records of investigations. These are public records in most circumstances.
  • Examine whether any evidence was tested and the results not reported. The most dangerous category of forensic misconduct (as in the Woods case) is not false positives but suppressed negatives. Evidence that was tested and excluded is evidence the defense should know about.
  • In sexual assault cases, specifically ask whether male DNA was tested and what the results were. The Woods case revealed a pattern of falsely reporting no male DNA in sexual assault samples. This is the most direct pattern of evidence relevant to defense review of similar cases in other jurisdictions.

 

The Broader Moment in Forensic Science

The Woods case is not an isolated event. It follows a long list of American forensic science scandals and Texas has its own entry near the top of that list.

The Houston Police Department Crime Lab: Texas’s Own Cautionary Tale

In November 2002, local news broadcasts in Houston highlighted problems in several criminal cases tied to the Houston Police Department crime laboratory. The HPD requested an independent audit of the lab’s DNA section, and DNA testing was immediately suspended. What the audit found was damaging enough. What the subsequent years of investigation revealed was staggering.

The scale of the failure:  The New York Times asked in March 2003 whether HPD ran the worst crime lab in the country. The DNA section’s technicians were inadequately trained and routinely misinterpreted data. Records were kept in disarray. Analysts routinely consumed all available evidence, making retesting impossible. The backlog of untested rape kits reached 6,600. Between 1998 and 2000, investigators uncovered four cases of “dry labbing” (the fabrication or tampering with evidence).

The Bromwich investigation:  The City of Houston brought in Michael Bromwich, a former U.S. Department of Justice Inspector General, to conduct an independent investigation. The Bromwich Report (a series of reports issued between 2003 and 2007) is recognized as the single largest and most expansive audit of forensic laboratory operations in American history. It found pervasive failures across multiple sections of the lab.

The human cost:  Four men were exonerated from wrongful convictions directly linked to HPD crime lab failures and misconduct: Josiah Sutton, George Rodriguez, Gary Alvin Richard, and Ronald Gene Taylor. Together, they lost more than 50 years of their lives imprisoned for crimes they did not commit. Sutton had been convicted of rape in 1999 based substantially on HPD analyst testimony that his DNA matched crime scene evidence. Independent retesting showed he was not the contributor. He had filed a handwritten request for retesting from prison. It was denied. He remained incarcerated until the lab’s broader collapse forced the retest that exonerated him.

The institutional response:  In 2005, the Texas Legislature created the Texas Forensic Science Commission specifically in response to the HPD scandal. It was the first commission of its kind in the United States with authority to investigate complaints of professional negligence and misconduct in forensic science disciplines. In 2014, Houston went further: it separated the crime lab from the police department entirely, creating the independent Houston Forensic Science Center, governed by its own board of directors rather than reporting to law enforcement. The HFSC is now cited as a model for how forensic laboratories should be structured.

The pattern in Houston was the same pattern that characterized Missy Woods’s operation in Colorado, Fred Zain’s fabrications at the West Virginia State Police lab in the 1990s, and Annie Dookhan’s mass misconduct at the Massachusetts drug laboratory in 2012: a trusted analyst, an institutional culture that did not verify, and a long trail of convictions that required review years later. The lesson that keeps not being learned is structural. Individual analyst misconduct persists because the systems built around trusted analysts create conditions for it to persist.

NIST’s recent release of new degraded-DNA reference materials and the ongoing national debate over the admissibility of whole-genome sequencing reflect a forensic science community in the middle of a serious self-examination. The Third Circuit’s TrueAllele ruling and the Woods case represent two poles of that moment: courts extending trust to sophisticated new forensic tools, while a decorated veteran analyst faces trial for systematically betraying the trust courts placed in her for decades.

The lesson is not that forensic science is unreliable. The lesson is that forensic science (like all human institutions) requires verification. The verification that matters in criminal cases is adversarial: a defense attorney who understands the science, demands the complete file, and has the training to challenge what does not hold up.

 

Sources

 

If you or a family member is facing charges where DNA evidence will play a roll call (214) 225-7117 for a free, confidential consultation.