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

Can Audio Recordings Be Used as Evidence in a Texas Criminal Case?

Can Audio Recordings Be Used as Evidence in a Texas Criminal Case?

Audio recordings which may come from police interrogations, undercover operations, phone calls, voicemails, and private conversations are powerful evidence in criminal cases. A jury hearing a defendant’s own voice making what sounds like an incriminating statement is profoundly persuasive. But audio evidence is subject to technical limitations, authentication requirements, and legal restrictions that can make […]

Can Body Camera and Surveillance Video Be Challenged in a Criminal Case?

Can Body Camera and Surveillance Video Be Challenged in a Criminal Case?

Video evidence has transformed criminal prosecution. Body-worn cameras on police officers, surveillance cameras on businesses and homes, dash cameras in patrol cars, Ring doorbells, and security DVR systems capture millions of hours of footage. When prosecutors present video evidence, jurors tend to accept it as objective proof. “The camera doesn’t lie.” Except that it can. […]

Can Social Media Posts Be Used Against You in a Texas Criminal Case?

Can Social Media Posts Be Used Against You in a Texas Criminal Case?

Prosecutors have discovered that social media accounts are gold mines of potential evidence. Your Facebook posts, Instagram stories, Snapchat messages, tweets, TikTok videos, and even your Venmo transactions can be used to establish motive, intent, location, relationships, state of mind, and even admissions. In sex crime cases, social media evidence is often used to establish […]

Can Someone Else’s Use of Your Computer Lead to Criminal Charges Against You?

Can Someone Else’s Use of Your Computer Lead to Criminal Charges Against You?

When law enforcement finds illegal material on a computer or traces illegal online activity to an IP address, they typically charge the person who owns the device or pays for the internet subscription. The assumption is straightforward: it’s your computer, so it must be your activity. But that assumption is often wrong. Computers, phones, tablets, […]

How Can Video Evidence Be Enhanced or Authenticated for Use in Court?

How Can Video Evidence Be Enhanced or Authenticated for Use in Court?

Surveillance video that appears too dark, too blurry, or too small to be useful may actually contain valuable evidence for the defense. Conversely, video that the prosecution presents as clear and compelling may have been manipulated, taken out of context, or processed in ways that altered its meaning. In both situations, forensic video analysis can […]

Can Text Messages Be Used as Evidence in a Texas Criminal Case?

Can Text Messages Be Used as Evidence in a Texas Criminal Case?

Text messages have become one of the most common forms of evidence in criminal cases. Prosecutors use them to establish motive, demonstrate intent, contradict alibis, and, in cases like online solicitation, to serve as the very foundation of the criminal charge. When text messages appear on a courtroom screen, jurors tend to treat them as […]

Can Call Detail Records Really Prove Where You Were at the Time of a Crime?

Can Call Detail Records Really Prove Where You Were at the Time of a Crime?

Call detail records (CDRs) are one of the prosecution’s favorite tools for placing a defendant at a specific location at a specific time. The prosecutor stands in front of the jury, points to a map covered in cell tower markers, and says: “The defendant’s phone connected to this tower at 11:47 p.m. which is the […]

Can Cell Phone Location Data Be Used Against You in a Texas Criminal Case?

Can Cell Phone Location Data Be Used Against You in a Texas Criminal Case?

Prosecutors love cell phone location data. It creates the impression of scientific precision, i.e. a digital trail showing exactly where a defendant was at any given moment. Jurors see maps with colored pins and cell tower coverage areas and assume the evidence is irrefutable. It is not. Cell phone location data is far less precise […]

What Is a Forensic Image of a Computer or Phone — And Why Does It Matter in Your Case?

What Is a Forensic Image of a Computer or Phone — And Why Does It Matter in Your Case?

When law enforcement seizes a computer, phone, or other electronic device in a criminal investigation, one of the first steps is creating a “forensic image” of that device. This forensic image becomes the foundation for all subsequent analysis and ultimately for the evidence the prosecution presents against you in court. If the forensic image is […]

Can the Police Search Your Phone Without a Warrant in Texas?

Can the Police Search Your Phone Without a Warrant in Texas?

Your smartphone contains more personal information about you than any other object you own including your text messages, emails, photos, browsing history, GPS location data, financial accounts, medical information, and social media activity. When law enforcement seizes and searches a phone during a criminal investigation, they gain access to an extraordinary volume of private data. […]