Forensic Science
Deep analysis of blood and breath testing, GC-FID calibration, partition-ratio variability, in vitro fermentation, retrograde extrapolation, and the pharmacokinetics of impairment — by attorneys who don’t just challenge the science, they teach it.
Latest in Forensic Science
The Intoxilyzer 9000: How Texas’s Breath Testing Instrument Works, What It Misses, and How to Challenge It
By Deandra Grant, J.D., M.S. (Pharmaceutical Science), ACS-CHAL Forensic Lawyer-Scientist, Certified Intoxilyzer Operator and Maintenance Technician If you submitted to a breath test during a DWI arrest in Texas, the instrument that…
The Tolerance Problem: Why a Blood Drug Concentration Does Not Equal Impairment
By Deandra Grant, J.D., M.S. (Pharmaceutical Science), ACS-CHAL Forensic Lawyer-Scientist The prosecution’s theory in every drug DWI case rests on a simple equation: the defendant had drugs in their system, therefore the…
Understanding the GC-FID: How the Instrument That Decides DWI Blood Test Cases Actually Works
By Deandra Grant, J.D., M.S. (Pharmaceutical Science), ACS-CHAL Forensic Lawyer-Scientist, Instructor, Axion Analytical Labs If you were arrested for DWI in Texas and a blood sample was taken, the number that the…
Blood Sample Integrity in DWI Cases: Everything That Can Go Wrong Between the Draw and the Lab
By Deandra Grant, J.D., M.S. (Pharmaceutical Science), ACS-CHAL Forensic Lawyer-Scientist In Texas DWI cases involving blood draws, the prosecution presents the lab result as if it is a fact: “The defendant’s blood…
Retrograde Extrapolation: The Math Prosecutors Use to Guess Your BAC at the Time of Driving — And Why It’s Often Wrong
By Deandra Grant, J.D., M.S. (Pharmaceutical Science), ACS-CHAL Forensic Lawyer-Scientist You were pulled over at 11:00 PM. Your blood was drawn at 12:15 AM. The lab reports your blood alcohol concentration (BAC)…
Roadside Cannabis Testing in 2026: The Science, the Devices, and What’s Actually Ready for the Courtroom
By Deandra Grant, J.D., M.S. (Pharmaceutical Science), ACS-CHAL Forensic Lawyer-Scientist, and Sol Bobst, Ph.D., DABT, ToxSci Advisors LLC As cannabis legalization expands across the United States, law enforcement agencies are searching for…
The Standardized Field Sobriety Tests: A Critical History of the Science Behind the Roadside Exercises That Decide Your Freedom
By Deandra Grant, J.D., G.C., M.S. (Pharmaceutical Science), ACS-CHAL Forensic Lawyer-Scientist, SFST Instructor Every DWI arrest in America follows essentially the same script. An officer pulls you over, asks if you’ve been…
Auto-Brewery Syndrome: When Your Body Brews Its Own Alcohol
Imagine feeling drunk without drinking a drop of alcohol. Imagine failing a breathalyzer test after eating a plate of pasta. For people living with auto-brewery syndrome (ABS), this is not a hypothetical.…
Rising Blood Alcohol Defense in Texas DWI Cases
In Texas, a driver can be charged with DWI if their blood alcohol concentration reaches 0.08 percent or higher at the time of testing. What many people do not realize is that…