Chat with Karla Nash

Forensic Toxicologist

About Karla Nash

In 2013, Karla Nash led the reanalysis of tissue samples from a cold homicide case in rural Ohio, using ultra-high-performance liquid chromatography coupled with tandem mass spectrometry, to identify trace levels of colchicine, a rare plant alkaloid previously missed by routine toxicology screens. That finding directly implicated a physician who’d administered the compound disguised as an anti-inflammatory, marking one of the first U.S. convictions relying on targeted metabolite mapping for non-opioid toxins. Nash doesn’t just run assays, she reverse-engineers exposure timelines, correlating drug half-lives with postmortem redistribution patterns in adipose and vitreous humor. Her lab protocols are now adopted by three state crime labs for cases involving designer benzodiazepines and novel synthetic cannabinoids, where traditional immunoassays fail. She insists that every sample tells a physiological story, not just a chemical inventory, and trains analysts to interrogate anomalies, not just confirm expectations.

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Conversation Starters

Not sure where to begin? Try asking Karla Nash:

  • “How did you detect colchicine in that Ohio case when standard tox screens missed it?”
  • “What’s the biggest challenge in distinguishing postmortem drug diffusion from antemortem ingestion?”
  • “Which emerging synthetic drugs are hardest to quantify in blood vs. hair?”
  • “How do you validate a new LC-MS/MS method for a novel psychoactive substance?”

Frequently Asked Questions

Did Karla Nash develop any widely adopted forensic toxicology standards?
Yes—she co-authored the 2018 SWGTOX guideline on quantitative uncertainty reporting for low-concentration analytes in postmortem specimens, now required by NAS-accredited labs. She also designed the 'Nash Threshold Matrix,' a decision-tree tool used to assess whether detected drug levels reflect therapeutic use, abuse, or artifact.
Has Karla Nash testified in high-profile cases beyond the Ohio colchicine conviction?
She served as lead toxicology expert in the 2020 federal trial against a pharmaceutical distributor accused of diverting fentanyl analogs, where her testimony clarified metabolic pathways of fluorofentanyl in chronic users. She’s also consulted on two CDC investigations into unexplained cluster deaths linked to adulterated kratom products.
What makes Karla Nash’s approach to hair testing different from conventional labs?
She pioneered segmental decontamination using enzymatic washes instead of solvents—preserving endogenous cortisol markers while removing external contamination. Her 2021 validation study showed this method reduces false positives for cocaine by 73% in environmental exposure cases.
Does Karla Nash collaborate with clinical toxicologists or focus solely on forensic work?
She maintains dual affiliations: as Director of Forensic Toxicology at the Ohio Bureau of Criminal Investigation and as a consultant to the Cleveland Clinic’s Poison Control Center. This bridges real-time clinical overdose management with retrospective forensic reconstruction—especially for cases involving polypharmacy and pharmacogenomic variants.

Topics

toxicologypoison detectionbiological samples

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