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Charles T. Ganz

Did a faulty DNA test lead to a wrongful sex crime conviction in Texas?

On Behalf of | Jun 5, 2025 | Criminal Defense

The idea that a scientific test could be wrong is alarming. Recently, concerns arose about certain DNA testing kits used in Texas. These kits sometimes gave misleading results, like saying there was no DNA when DNA was clearly present, or claiming DNA came from only one person when it actually belonged to several. This serious issue has affected many criminal cases, potentially over a thousand across the state, making people question past convictions.

What happened?

More than 1,000 criminal cases in Texas are under review due to faulty DNA tests manufactured by Qiagen, one of the world’s largest test manufacturers. The Houston Forensic Science Center discovered that the Qiagen EZ1&2 Investigator DNA test kits were incorrectly reporting insufficient or inaccurate DNA results, raising concerns about the reliability of evidence in these cases. The Texas Department of Public Safety is also reviewing around 700 cases at one lab alone.

The issue stems from a pH balance problem in one of the chemicals used in the test kits, which Qiagen claims to have fixed by altering the manufacturing process. However, there are concerns that not all affected kits have been identified.

Law enforcement agencies and forensic centers are now reviewing these cases to understand the true impact. They are asking hard questions: Was someone wrongfully convicted because of a flawed test? Do we need to retest evidence? This situation introduces a deep concern for fairness and justice.

The role Of DNA tests in Texas criminal cases for sex crimes

DNA tests play a huge part in sex crime cases in Texas. When someone reports a sex crime, investigators collect evidence that might contain DNA, such as:

  • Blood
  • Saliva
  • Semen
  • Skin cells.

This DNA can link a suspect directly to a crime scene or a victim, making it powerful evidence in court. These samples then go to state-approved labs for molecular testing. This testing examines the unique genetic code found in the DNA to identify individuals. The results are crucial for charging decisions and trials.

Individuals accused of a sex crime or other felony are required to provide a DNA sample. This sample is analyzed, and if the individual is convicted of a sex offense, their DNA is stored in the Combined DNA Index System (CODIS).

Newly proposed pilot program

For a long time, Texas crime labs faced a big problem: a huge backlog of DNA samples waiting to be tested. This meant cases sometimes got delayed for months, or even years, just waiting for crucial DNA results and leaving those accused without answers or a way to fight charges effectively.

To tackle these problems, Texas has explored new ways to speed up DNA testing and make it more accurate. One positive step is a newly proposed pilot program. This program aims to find better and faster ways to process DNA evidence, reducing wait times and improving the quality of the tests. It’s a step towards ensuring justice happens more quickly and accurately for everyone involved.

Take Action if you suspect a problem

If you or someone you care about faces a sex crime conviction in Texas, especially if DNA evidence was a key part of the case, you need to act. The revelation of faulty DNA tests means past convictions might need a fresh look. Do not hesitate to question the evidence that put someone behind bars.

A skilled criminal defense attorney can make a profound difference. They understand the complex world of DNA evidence and forensic science. A lawyer will review all the evidence in your case, including the specific DNA tests used. They can determine if the faulty tests identified in Texas played a role in your conviction.

If you believe a faulty DNA test led to your wrongful conviction, take immediate action. First, gather all documents related to your case, especially anything about the DNA evidence. Second, contact our criminal defense attorney, Charles T. Ganz, who has been selected for inclusion in the Texas Super Lawyers and Rising Stars lists year after year. Call 713-364-0953 or email us to discuss your case.

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