All Articles
Browse every published article, from the latest research to earlier analysis. Use the page numbers below to explore the complete archive.
Residual THC in Frequent Cannabis Users: What Blood, Urine, and Oral Fluid Can—and Cannot Date
Controlled-abstinence studies show that frequent cannabis users can retain measurable cannabinoids for days. Learn why detection, recent use, and impairment are separate questions.
Comparing Two Toxicology Reports: A Specimen and Method Worksheet
Compare specimen, collection time, analyte, method, units, and reporting thresholds before treating two toxicology results as agreement or disagreement.
A New Nitazene Plasma Method: Reading Beyond the Detection Limit
Interpret a 2026 micro-QuEChERS LC–MS/MS method through its matrix, quantitative range, validation limits, and casework application.
Nitazene Test Strips: Analogue Coverage and Caffeine Interference
A laboratory evaluation shows why nitazene strip results depend on the analogue, concentration, and mixture rather than the class name alone.
Mitragynine and Its Diastereomers: Why Accurate Mass Is Not Enough
A urine study demonstrates how co-eluting kratom alkaloids can affect mitragynine identification and threshold-based reporting.
Medetomidine in Urine: Metabolites, Hydrolysis, and Negative Results
How metabolite selection and enzymatic pretreatment affect medetomidine exposure detection, with limits on interpretation of urine concentrations.
7-Hydroxymitragynine Stability: What a Plasma Experiment Can Establish
Distinguish experimental conversion of 7-OH in human plasma from validated specimen stability, in-vivo kinetics, and product attribution.
Nitazenes in Dried Blood Spots: Storage Findings Need Compound-Specific Interpretation
A four-nitazene stability study illustrates why storage conclusions depend on concentration, temperature, matrix, and the measured endpoint.
Postmortem Methamphetamine Redistribution: Why Sampling Site Changes the Result
Postmortem methamphetamine can differ across heart, peripheral blood, vitreous, and tissues. Learn why published ratios are evidence—not universal correction factors.
Toxicology Laboratory Records: Evidence Review Checklist
A checklist of toxicology laboratory records for evidence review, covering specimen handling, methods, validation, quality controls, and underlying data.
What a Fentanyl Test Strip Can and Cannot Establish
A published five-lot study shows why fentanyl test-strip results depend on lot, analog, interference, dilution, and the limits of a negative response.
What a Blue Scott Cocaine Test Really Shows
A blue Scott-test response is presumptive. Published cobalt-thiocyanate research explains lidocaine interference, reaction chemistry, and why confirmation records matter.
When Newborn THC Urine Screens Meet Specimen Contamination
A published study found assay-dependent baby-wash interference in newborn cannabinoid urine screening, making collection and confirmation records essential.
When Matching LC-MS/MS Transitions Do Not Prove THCCOOH Identity
An authentic-serum interference shared monitored THCCOOH transitions, showing why chromatographic separation and revalidation matter.
Postmortem Blood Sampling Sites: Interpretation Guide
Compare central and peripheral postmortem blood, collection artifacts, redistribution, and the records needed to interpret toxicology results.
Postmortem Ethanol: Formation, Preservation, Interpretation
Postmortem ethanol may reflect drinking, microbial formation, or both. Learn how matrix, collection, preservation, and biomarkers shape interpretation.
What a Negative Urine Immunoassay Does Not Exclude
A negative urine immunoassay does not exclude every drug or exposure. Assay targets, cutoffs, timing, dilution, and device effects shape the result.
Methamphetamine Blood Levels and Driving Impairment
Review what methamphetamine blood results can establish, why studies disagree about concentration and impairment, and which records support interpretation.
Methamphetamine Driving Studies: Concentration, Fatigue & SFSTs
Technical review of controlled and forensic methamphetamine driving studies: concentration-effect findings, simulator performance, fatigue, SFSTs, and limits of applying group data to individual cases.
Presumptive Urine Drug Screens: Why Confirmation Matters
Learn why urine immunoassay screens are presumptive, how false positives and negatives occur, and when confirmation or methamphetamine isomer testing matters.