Forensic Scientists in Zurich Extend Detection Window for Sedative GHB

Researchers at the Institute of Forensic Medicine at the University of Zurich have integrated a new diagnostic method into their laboratory procedures to detect the drug gamma-hydroxybutyrate, known as GHB, in human body fluids over an extended timeframe. By targeting a specific metabolic byproduct rather than the substance itself, forensic toxicologists can now identify evidence of ingestion up to three days after exposure, according to details provided by the institute.

Previously, forensic toxicologists faced narrow time limits when analyzing suspected cases involving GHB. Standard blood testing could reliably trace the compound for up to six hours after consumption, while urine tests lost diagnostic efficacy after twelve hours. In many reported incidents, blood and urine samples cannot be collected within those initial hours, complicating subsequent forensic evaluations.

The updated testing framework relies on a metabolic breakdown product created as the human body processes the substance. Controlled clinical studies conducted with healthy volunteers demonstrated that the biomarker remained detectable across all test subjects after 28 hours. A majority of participants continued to show positive results after two days, with certain individual cases retaining traceable levels for up to 72 hours.

Andrea Steuer, deputy head of the Department of Forensic Pharmacology and Toxicology at the Zurich institute, stated that incorporating this biomarker into routine methodology provides examiners with a broader operational window. Steuer noted that toxicologists can now yield concrete findings even when samples are gathered 24 hours or more after an incident, though she emphasized that affected individuals should still seek medical sampling as early as possible.

The analytical constraints associated with short GHB detection periods affect forensic institutes internationally. The Zurich research team expects the biomarker method to draw interest from legal medicine laboratories worldwide seeking to improve their toxicological detection capabilities.

Written by Christiane Hofreiter christiane.hofreiter@alpineweekly.com