Knowledge Vault Blog

The Knowledge Vault Blog

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

View Blog Posts

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

Assault and Assault Family Violence in Texas: What the Charge Actually Means and What Happens Next

Assault and Assault Family Violence in Texas: What the Charge Actually Means and What Happens Next

By Deandra Grant, J.D., M.S. (Pharmaceutical Science), ACS-CHAL Forensic Lawyer-Scientist If you were just arrested for assault or assault family violence in Texas, the first thing you need to understand is what you are actually charged with because “assault” in Texas covers a much wider range of conduct than most people realize, the penalties vary […]

Operating a Motor Vehicle in Texas: Can You Get a DWI While Parked?

Operating a Motor Vehicle in Texas: Can You Get a DWI While Parked?

By Deandra Grant, J.D., M.S. (Pharmaceutical Science), ACS-CHAL Forensic Lawyer-Scientist You didn’t drive anywhere. You pulled into a parking lot, or you never left the spot where you were parked. The car may have been running. You may have been asleep. But you didn’t drive. Can you still be convicted of DWI in Texas? The […]

Law Enforcement’s New AI Tool Can Search Your Seized Phone in Minutes. Here’s What Your Defense Attorney Needs to Know.

Law Enforcement’s New AI Tool Can Search Your Seized Phone in Minutes. Here’s What Your Defense Attorney Needs to Know.

By Deandra Grant, J.D., M.S. (Pharmaceutical Science), ACS-CHAL Forensic Lawyer-Scientist When law enforcement seizes your phone in connection with a criminal investigation, the clock used to work in your favor at least a little. Processing a device, extracting the data, and having a forensic analyst make sense of thousands of messages, location pings, and call […]

How Can Digital Forensics Help Defend Against Criminal Charges in Texas?

How Can Digital Forensics Help Defend Against Criminal Charges in Texas?

Criminal cases increasingly turn on digital evidence. Prosecutors use data from phones, computers, GPS records, surveillance cameras, social media accounts, and cloud storage to build their cases. They present this evidence as if it were objective and irrefutable and many defense attorneys accept it at face value because they lack the technical knowledge to evaluate […]

Drug Delivery and Distribution Charges in Texas: How the State Builds the Case and Where the Defense Challenges It

Drug Delivery and Distribution Charges in Texas: How the State Builds the Case and Where the Defense Challenges It

By Deandra Grant, J.D., M.S. (Pharmaceutical Science), ACS-CHAL Forensic Lawyer-Scientist The difference between a drug possession charge and a drug delivery charge in Texas is not just the severity of the offense. It is often the difference between a misdemeanor and years in prison. Manufacture or delivery of a controlled substance in Penalty Group 1 […]

Texas Just Banned Smokable Hemp Through the Back Door. Here’s What That Means in a Criminal Courtroom.

Texas Just Banned Smokable Hemp Through the Back Door. Here’s What That Means in a Criminal Courtroom.

Effective today (March 31, 2026) the Texas Department of State Health Services smokable hemp regulations are in effect. Hemp flower, pre-rolled joints, live rosin, live resin: off compliant store shelves. The rules adopt a “total THC” calculation that includes THCA, and since most smokable hemp products contain THCA well above 0.3%, they no longer meet […]

Money Laundering Charges in Texas: How Investigations Work and How to Defend Against Them

Money Laundering Charges in Texas: How Investigations Work and How to Defend Against Them

By Deandra Grant, J.D., M.S. (Pharmaceutical Science), ACS-CHAL Forensic Lawyer-Scientist Money laundering prosecutions are among the most technically complex criminal cases a defendant can face. The investigations are often long-running, the evidence is predominantly financial, and the charges can come from state authorities, federal prosecutors, or both simultaneously. Many people facing money laundering charges did […]

What Is Coelution in Gas Chromatography — And Why Your Attorney Should Know

What Is Coelution in Gas Chromatography — And Why Your Attorney Should Know

Of all the scientific challenges to blood test accuracy in DWI cases, coelution may be the most technically significant and the least understood by defense attorneys. Coelution occurs when two or more chemical compounds exit the gas chromatography column at the same time, causing their detector signals to overlap. When this happens, the instrument cannot […]

Can Medical Conditions Like GERD or Diabetes Cause a False Positive Breath Test?

Can Medical Conditions Like GERD or Diabetes Cause a False Positive Breath Test?

The Intoxilyzer 9000 measures the amount of alcohol in a breath sample using infrared spectroscopy. It assumes that all detected alcohol came from deep lung air and represents the defendant’s blood alcohol concentration. But several common medical conditions can introduce substances into the breath that the instrument misidentifies as ethanol — or that elevate the […]

How Blood Sample Contamination Happens — And How to Recognize It

How Blood Sample Contamination Happens — And How to Recognize It

The prosecution’s blood test result in your DWI case is only as reliable as the integrity of the blood sample it was derived from. If the sample was contaminated at any point (during collection, transportation, storage, or analysis) the BAC result does not accurately reflect the alcohol concentration in your bloodstream at the time the […]