A detected concentration needs the full exposure and pathological context.
A forensic report investigated a death after smoking Buscopan tablets using imaging, autopsy, histology and toxicology. Scopolamine-related compounds were found along with several prescribed medicines, including lorazepam, diazepam and metabolites described as within therapeutic ranges.
One death cannot define a universally safe or lethal concentration. Postmortem interpretation, combined exposure and the limitations of reference ranges remain important. The report’s attribution did not isolate every possible contribution from the other drugs.
Distinguish a substance’s presence from its assigned causal role. Do not call the death a benzodiazepine overdose merely because the screen found those compounds. Equally, a therapeutic-range label is not independent proof of zero contribution; the opinion must integrate the entire record.
Source: PMC8062144, supplied full-text paper. Findings are paraphrased; forensic implications are an interpretation.
Related: A Synthetic Cannabinoid Enhanced Clonazepam but Not Clobazam in One Mouse Seizure Model.