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

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 […]

Ask Deandra: How Accurate Is the Breathalyzer in Texas?

Ask Deandra: How Accurate Is the Breathalyzer in Texas?

By Deandra Grant, J.D., M.S. (Pharmaceutical Science), ACS-CHAL Forensic Lawyer-Scientist The question: How accurate is the breathalyzer in Texas? The short answer: Less accurate than the prosecution will tell the jury. Texas uses the Intoxilyzer 9000, an infrared breath testing instrument that produces a single number presented in court as a blood alcohol concentration. That […]

Ask Deandra: What Is a SCRAM Device?

Ask Deandra: What Is a SCRAM Device?

The question: What is a SCRAM device? The short answer: A SCRAM device is a tamper-resistant ankle bracelet that continuously monitors the wearer’s skin for alcohol consumption. Texas courts order SCRAM monitoring as a condition of bond or probation in many DWI cases, and the device automatically reports any detected drinking — along with tamper […]

When the Video Might Be a Lie: How Texas Defense Lawyers Are Fighting Deepfake-Era Evidence

When the Video Might Be a Lie: How Texas Defense Lawyers Are Fighting Deepfake-Era Evidence

For decades, a grainy surveillance clip or a damning social-media video was close to game-over for the defense. Juries tend to believe what they can see and hear. But artificial intelligence has changed the math. Today, a convincing fake voicemail can be produced in minutes. A face can be swapped into a bar fight. A […]

Deandra Grant Marks Her 15th Year on D Magazine’s Best Lawyer List

Deandra Grant Marks Her 15th Year on D Magazine’s Best Lawyer List

Deandra Grant Law is proud to announce that Managing Partner Deandra Grant has been named to D Magazine’s Best Lawyers in Dallas list again for 2026 which is her 15th consecutive year on this distinguished list. Each May, D Magazine publishes its annual Best Lawyers list, honoring attorneys who represent the people and institutions of […]

Drug-Free Zone Enhancements in Texas: How Your Location at the Time of Arrest Can Double Your Sentence

Drug-Free Zone Enhancements in Texas How Your Location at the Time of Arrest Can Double Your Sentence

You were not near a school. You were not selling drugs to children. You may not have even known there was a school or playground anywhere near you. But if Texas Health and Safety Code §481.134 applies to your drug charge, your sentence could be dramatically higher than what the underlying offense would have carried […]

DWI Defense Expertise Recognized at National Criminal Justice Seminar

DWI Defense Expertise Recognized at National Criminal Justice Seminar

The image highlights a respected criminal defense attorney featured at a major legal event hosted by The Florida Bar Criminal Justice Section. The seminar, titled “Just Because It’s on Paper Doesn’t Make It So… Going Beyond the Lab Report,” focuses on advanced DWI defense strategies and the importance of challenging forensic evidence. In the photo, […]