Guides to expert-witness selection, qualifications, reports, depositions, testimony, and forensic consulting.
Category: Expert Witness
Rapid Urine Drug Tests in Court: 12 Records That Matter
A litigation-focused checklist for evaluating presumptive urine drug screens, device cutoffs, quality controls, confirmation data, chain of custody, and impairment claims.
Methamphetamine Toxicology Lawyer and Expert Case Review
Legal and scientific review of methamphetamine evidence involving driving, postmortem redistribution, laboratory methods, and expert testimony.
Rule 702 and Forensic Toxicology Expert Testimony
A scientific issue-spotting framework for qualifications, sufficient facts, reliable methods, reliable application, and helpful forensic toxicology testimony.
How to Review a Toxicology Laboratory Packet
A step-by-step guide to reviewing specimen records, analytical methods, calibration, controls, raw data, calculations, corrective actions, and interpretation.
Positive Drug Test vs. Impairment: What It Proves
A positive toxicology result can establish detection or exposure, but impairment, timing, dose, and causation require additional scientific and case evidence.
Forensic Toxicology Case Review Checklist
A practical records checklist for reviewing specimen identity, chain of custody, raw laboratory data, calibration, quality controls, validation, and toxicology interpretation.
Vehicle Code Section 21221: What Actually Applies to a Motorized Scooter Rider
California Vehicle Code section 21221 applies driver rules to scooter riders, while section 21221.5 creates a separate $250 under-the-influence offense.
Concentration Is Not Impairment: THC Blood Levels in California Driving Cases
California has no per se THC limit, and the pharmacology explains why. Blood THC falls fastest when effect is still rising, and frequent users carry measurable levels long after any effect.
“They Are Not Tests of Driving” — What the Field Sobriety Tests Actually Measure
The woman who built the Standardized Field Sobriety Tests testified under oath that they do not measure driving. A forensic toxicology review of the science behind HGN, the Walk-and-Turn, and the One-Leg Stand.
When Should a Lawyer Hire an Expert Witness?
In the simplest terms, an expert witness is a person who testifies in a trial because of their vast knowledge in a subject or field that is pertinent to the case.
Why an Expert Witness Can Change a Case Outcome
Every court case is different, meaning the experts the case requires will vary, whether for the benefit of the prosecution or defense. Hiring an expert witness means that there will be someone with a deep understanding of the subject under litigation to weigh in on the case.
Drug-Injection Sites: An Expert-Witness Analysis
A few months ago, a panel consisting of expert witnesses , drug experts and politicians met to discuss the opioid epidemic devastating New England. The panel promoted safe injection sites as a solution. A safe injection site is a place an addict could inject heroin without fear of getting arrested.
