A former Colorado Bureau of Investigation forensic scientist has been sentenced to 10 years in prison after admitting to manipulating DNA evidence and official records in a scandal that has forced authorities to revisit more than 1,000 criminal cases, including hundreds involving sexual assault.
Yvonne “Missy” Woods, who spent nearly three decades working in Colorado’s state crime laboratory, was sentenced on September 8 after pleading guilty to cybercrime, first-degree perjury, attempting to influence a public servant and forgery. Her misconduct affected forensic work carried out over several years and has raised questions about convictions, acquittals and investigations that relied on evidence she handled.
Brandspur Brand News reports that one of the most troubling findings involved 32 sexual-assault cases in which investigators said Woods deleted DNA values showing male DNA was present or indicating possible contamination requiring additional testing. Reports were subsequently issued stating that no male DNA had been detected, potentially depriving investigators of opportunities to conduct further forensic examination.
The cases involved women and children who had reported sexual assaults. Prosecutors said the manipulation was particularly consequential because DNA evidence can determine whether investigators identify a suspect, exclude an innocent person or obtain new leads in cases that might otherwise remain unresolved.
The investigation into Woods began in 2023 after irregularities were discovered in her work. An intern examining a sample Woods had processed in 2018 noticed missing DNA data, prompting a deeper review of her casework.
Authorities eventually identified 53 cases in which Woods was linked to false or misleading laboratory reports. Twelve involved people who had been criminally charged. Three proceeded to trial, producing one conviction and two acquittals.
The consequences have extended into homicide cases. Woods admitted giving false testimony during a trial that resulted in a first-degree murder conviction. At least one murder conviction connected to work she performed has since been overturned, while prosecutors have had to reassess other cases in which the reliability of forensic evidence could be challenged.
The scale of the subsequent review has been much larger than the 53 cases containing identified false or misleading reports. The Colorado Bureau of Investigation examined more than 1,000 cases in which Woods had some involvement, spanning work dating from 1994 until 2023.
That distinction is important. Investigators have not concluded that Woods fabricated DNA evidence in every case she touched. An earlier CBI investigation found that she deleted or altered information, failed to properly document testing and bypassed procedures that should have triggered additional analysis. Authorities said they did not find evidence that she fabricated DNA profiles or created false DNA matches.
Woods’ conduct nevertheless undermined confidence in evidence used across the criminal justice system. By 2024, CBI had identified 652 cases affected by data manipulation between 2008 and 2023, before the wider examination of her work expanded to more than 1,000 cases.
The scandal has also imposed a substantial financial burden on Colorado. Authorities previously estimated costs associated with responding to the misconduct at more than $11 million, covering staff time, retesting, reimbursements to prosecutors and an external assessment of the forensic division.
Questions have also emerged about how Woods’ conduct remained undetected for so long. Concerns about aspects of her work had reportedly surfaced internally years before the full investigation began, intensifying scrutiny of supervision and quality-control procedures within the laboratory.
Colorado lawmakers subsequently approved measures intended to strengthen the reporting of misconduct in forensic laboratories, while the CBI commissioned an independent assessment of its forensic services and began implementing procedural reforms.
Woods apologised in court before receiving her sentence, acknowledging the damage her actions caused to the integrity of the justice system and to people connected with the affected cases.
Jefferson County District Court Judge Andrew Poland imposed a 10-year sentence for cybercrime, alongside concurrent sentences of six years for perjury, six years for attempting to influence a public servant and three years for forgery. She will also face three years of mandatory parole.
In explaining the punishment, Poland stressed that the misconduct was intentional and committed by a highly trained professional occupying a position of exceptional trust.
The case has become about far more than one forensic scientist. Every compromised laboratory record creates consequences in two directions: defendants may question whether evidence used against them was reliable, while victims and their families face the possibility that crucial evidence capable of advancing their cases was mishandled or lost.
For the hundreds of sexual-assault cases touched by the review, that uncertainty is particularly profound. DNA evidence can remain valuable for years and sometimes provides the breakthrough that allows investigators to revisit an unresolved case long after the crime occurred.
The continuing task for Colorado authorities is therefore not simply to account for Woods’ misconduct, but to determine case by case where unreliable forensic work may have altered the course of an investigation, prosecution or conviction — and what can still be repaired.
