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

Caught with a THC Vape Cartridge at DFW Airport? What Happens Next and What It Means

Caught with a THC Vape Cartridge at DFW Airport What Happens Next and What It Means

The THC vape cartridge in your carry-on bag just cost you a felony charge. That sentence captures what tens of thousands of travelers who pass through Dallas-Fort Worth International Airport every year do not know until it is too late. A THC vape cartridge that is entirely legal where you purchased it, that you have […]

Prescription Drug Charges in Texas: Doctor Shopping, Prescription Fraud, and the Pharmacological Defense

Prescription Drug Charges in Texas Doctor Shopping, Prescription Fraud, and the Pharmacological Defense

Most people arrested on prescription drug charges did not think of themselves as drug offenders. They were patients (often managing real, documented pain or anxiety) who at some point crossed a line they may not have fully understood existed. But Texas Health and Safety Code §481.129 treats prescription fraud as a serious felony, and prosecutors […]

Bank Fraud, Wire Fraud, and Mail Fraud: What’s the Difference and Why It Matters

Bank Fraud, Wire Fraud, and Mail Fraud What’s the Difference and Why It Matters

Federal fraud prosecutions almost always involve multiple statutes charged together. A scheme that uses email communications, involves a bank, and includes documents sent through the mail can produce wire fraud counts, bank fraud counts, and mail fraud counts with each carrying its own penalty, each requiring the same or similar evidence, and each adding to […]

Marijuana Charges in Texas: What the Law Actually Says in 2026

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Texas has not legalized marijuana. It has not decriminalized it. But since 2019, prosecuting a marijuana case in Texas has become scientifically more complicated than it used to be and understanding why is essential for anyone arrested with cannabis in this state. The short version: marijuana and hemp are the same plant. The legal distinction […]

Firearms and Family Violence in Texas: How a Misdemeanor Conviction Can Permanently Cost You Your Gun Rights

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Most people facing a family violence assault charge assume the gun rights question only applies to felonies. It does not. A misdemeanor family violence conviction in Texas can cost you your right to possess a firearm under both Texas and federal law and the two legal systems impose different restrictions, different timelines, and different definitions […]

What Should You Do if You’re Accused of Sexual Assault in Texas?

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Being accused of sexual assault is one of the most frightening and isolating experiences a person can face. The accusation alone, before any investigation, before any charges, before anyone has heard your side, can upend your life. Your reputation, your relationships, your career, and your freedom are all at stake from the moment the words […]

Stalking Charges in Texas: The Statute, the Elements, and How to Defend Against Them

Stalking Charges in Texas The Statute, the Elements, and How to Defend Against Them

Stalking is a felony in Texas. It does not require physical contact. It does not require a threat of violence. It does not require that the defendant and the alleged victim have any prior relationship. Under Penal Code §42.072, a person commits stalking by engaging in a course of conduct directed at a specific person […]

DWI Arrest Quotas: What the Phoenix Lawsuit Reveals and What Texas Law Says About It

DWI Arrest Quotas: What the Phoenix Lawsuit Reveals and What Texas Law Says About It

On December 29, 2024, Brianna Longoria (a California woman in Phoenix for her wedding) was pulled over, arrested for DUI, and booked into jail. Her breathalyzer result: triple zeros. Her blood test: zero alcohol, zero drugs. The red light violation that justified the stop: later voided by the arresting officer herself after reviewing body camera […]

Ask Deandra: Can I Refuse a Breath Test in Texas?

Ask Deandra: Can I Refuse a Breath Test in Texas?

By Deandra Grant, J.D., M.S. (Pharmaceutical Science), ACS-CHAL Forensic Lawyer-Scientist The question: Can I refuse a breath test in Texas? The short answer: Yes. You can legally refuse a breath test in Texas after a DWI arrest, but refusal carries consequences under the state’s implied consent law including an automatic driver’s license suspension and the […]

Ask Deandra: Can a DWI Blood Test Be Wrong?

Ask Deandra: Can a DWI Blood Test Be Wrong?

By Deandra Grant, J.D., M.S. (Pharmaceutical Science), ACS-CHAL Forensic Lawyer-Scientist The question: Can a DWI blood test be wrong? The short answer: Yes. Blood alcohol and blood drug testing is presented to juries as the gold standard of forensic evidence, but every step between the needle and the laboratory report is a potential source of […]