Knowledge Vault Blog

The Knowledge Vault Blog

Forensic Science. Criminal Defense Strategy. The Law Behind the Law.

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Welcome to the Knowledge Vault Blog — where the attorneys, scientists, and forensic experts at Deandra Grant Law share what we know. This is not a typical law firm blog. It is a research library built by practitioners who teach forensic science courses, grade certification exams, and testify as experts in courtrooms across Texas.

Our Managing Partner, Deandra Grant, holds a Master’s Degree in Pharmaceutical Science, teaches the ACS-CHAL Forensic Lawyer-Scientist courses at Axion Analytical Labs, serves on the faculty of the Borkenstein Drug Course at Indiana University, and chairs the DUI Defense Lawyers Association’s national Board Certification program. She is a member of the American Academy of Forensic Sciences, the American Chemical Society, the Society of Toxicology, and the International Association of Forensic Science Consultants. Partner Douglas Huff brings ACS-CHAL credentials and Garrett Discovery digital forensics training. Federal Defense Attorney James Lee Bright contributes decades of experience in federal criminal practice.

Inside the Knowledge Vault you will find:

Hot Takes – The latest on high profile trials, changes to the law, rulings by the Supreme Court and forensic science news.

Forensic Science & DWI Defense — Deep analyses of blood and breath testing science, GC-FID instrument calibration, partition ratio variability, in vitro fermentation, retrograde extrapolation, and the pharmacokinetics of drug impairment. Written by attorneys who don’t just challenge the science — they teach it.

Field Sobriety Test Analysis — The history, validation research, and scientific limitations of the NHTSA Standardized Field Sobriety Tests, written by a certified SFST Instructor who was the first attorney in Texas to pass the Forensic Sobriety Assessment Certification exam.

Federal Criminal Defense — Guides to federal conspiracy, sentencing guidelines, proffer sessions, grand jury investigations, asset forfeiture, and the critical differences between state and federal prosecution. Written by attorneys who practice in federal courts across Texas.

Digital Forensics & Electronic Evidence — How cell phone location data, social media records, body cameras, call detail records, and computer forensics affect criminal cases — and how to challenge them.

Sex Crime Defense — Outcry witnesses, SANE exams, DNA evidence challenges, false accusations, registry implications, and defense strategies for the most serious allegations.

Emerging Science & Policy — Roadside cannabis testing technology, marijuana rescheduling and federal sentencing, Canadian travel after DWI, and the evolving intersection of science, law, and public policy.

Texas Criminal Courts & Local Practice — County-by-county courts guides, DA office profiles, courthouse walkthroughs, and city-specific enforcement patterns across Dallas, Collin, Denton, Tarrant, Rockwall, and McLennan counties.

Every article in the Knowledge Vault is written or reviewed by the attorneys at Deandra Grant Law.

We don’t publish filler. We publish the analysis we wish existed when we were building our own expertise and the information our clients deserve to have access to before they walk into a courtroom.

If you are facing criminal charges or a DWI in Texas and want to speak with the attorneys behind this work, call (214) 225-7117 or visit our Schedule an Appointment page for a free, confidential consultation.

Knowledge Vault Blog

Bite Marks, Hair Analysis, and the Science Courts Are Still Admitting

Bite Marks, Hair Analysis, and the Science Courts Are Still Admitting

In 2016, the President’s Council of Advisors on Science and Technology (PCAST) published a detailed scientific assessment of forensic feature-comparison methods used in criminal courts. Feature-comparison methods are those that attempt to determine whether a crime scene sample came from a specific source (a person, a weapon, a shoe) by comparing patterns or features. Bite […]

Cold Cases and the Fourth Amendment: What Genetic Genealogy Means for Defendants

Cold Cases and the Fourth Amendment What Genetic Genealogy Means for Defendants

Florida Attorney General James Uthmeier announced this week a $600,000 partnership with Othram (a Texas-based forensic biotechnology company) to deploy investigative genetic genealogy against Florida’s backlog of more than 21,000 unsolved homicides, some dating back to the 1960s. The initiative begins with three cold cases from the 1970s and 1980s in Broward County, Miami-Dade, and […]

Colorado Just Made History on Field Drug Tests. Texas Hasn’t.

Colorado Just Made History on Field Drug Tests. Texas Hasn’t.

On March 26, 2026, Colorado Governor Jared Polis signed House Bill 1020 into law, making Colorado the first state in the nation to prohibit arrests based solely on the results of colorimetric field drug tests. The bill passed both chambers of the Colorado legislature without a single dissenting vote. Texas has no equivalent law. Field […]

Drones, Drugs, and Dirty COs: The Legal Anatomy of a Prison Contraband Case

Drones, Drugs, and Dirty COs The Legal Anatomy of a Prison Contraband Case

In January 2026, the Texas Department of Criminal Justice and the Office of Inspector General launched a sting operation at the Mark W. Michael Unit in Tennessee Colony, Anderson County, after learning that drones were being used to drop large bundles of contraband over the prison walls. When the operation concluded, investigators had seized more […]

Continuous Violence Against the Family in Texas: How Two Misdemeanors Become a Felony

Continuous Violence Against the Family in Texas How Two Misdemeanors Become a Felony

Most people charged with family violence assault are looking at a Class A misdemeanor which carries up to one year in county jail and a $4,000 fine. That is serious, but it is a misdemeanor. Continuous violence against the family under Texas Penal Code §25.11 is different. Under §25.11, two separate incidents of family violence […]

Colorado Just Made History on Field Drug Tests. Texas Hasn’t

Colorado Just Made History on Field Drug Tests. Texas Hasn’t.

On March 26, 2026, Colorado Governor Jared Polis signed House Bill 1020 into law, making Colorado the first state in the nation to prohibit arrests based solely on the results of colorimetric field drug tests. The bill passed both chambers of the Colorado legislature without a single dissenting vote. Texas has no equivalent law. Field […]

Can You Get Life in Prison for a DWI in Texas? The Peace Officer Enhancement Explained

Can You Get Life in Prison for a DWI in Texas? The Peace Officer Enhancement Explained

A Tarrant County jury recently sentenced DeAujalae Evans, 26, to life in prison after she pleaded guilty to intoxication manslaughter in the death of Fort Worth Police Sgt. Billy Randolph. Sergeant Randolph was working a crash scene on I-35W in August 2024 when Evans (who reportedly consumed approximately 10 shots of tequila that night)  struck […]

Oral Fluid Drug Testing in Texas: Coming to a Roadside Near You

Oral Fluid Drug Testing in Texas Coming to a Roadside Near You

Oral fluid drug testing (collecting saliva and testing it for the presence of drugs) is expanding in both criminal justice and workplace settings, and Texas is actively developing its use in roadside DWI investigations. Understanding what oral fluid testing can and cannot show, how it differs from urine and blood testing, and where its reliability […]

When Drug Distribution Becomes a Homicide Case: Lessons from the Matthew Perry Sentencing

When Drug Distribution Becomes a Homicide Case Lessons from the Matthew Perry Sentencing

On April 8, 2026, U.S. District Judge Sherilyn Peace Garnett sentenced Jasveen Sangha (the Los Angeles drug dealer federal prosecutors called the “Ketamine Queen”) to 15 years in federal prison for distributing the ketamine that killed actor Matthew Perry in October 2023. The sentence was the harshest imposed on any of the five defendants in […]

Criminal Justice Reform in 2026: What It Means for Texas Defendants

Criminal Justice Reform in 2026 What It Means for Texas Defendants

National headlines about criminal justice reform in 2026 tell a story of accelerating bipartisan progress at the state level: more reform laws passed in 2025 than in 2024, and a growing list of policy changes that reformers describe as achievable. The Prison Policy Initiative’s annual guide to winnable reforms identifies 34 specific changes across eight […]