Not all causes of death are visible to the eye. Some leave no bruise, no fracture, no tear - only biochemical disruption.

In this episode, we explore the principles of forensic toxicology: the science of detecting and interpreting drugs, poisons, and chemical agents within the body. Toxicology often transforms uncertainty into clarity - but only when results are interpreted with precision.

We examine:

* Absorption, distribution, metabolism, and excretion of toxins.

* Therapeutic, toxic, and lethal ranges.

* Post-mortem redistribution.

* Sample collection - blood sites, urine, vitreous humour.

* The importance of timing.

* Tolerance and chronic use.

* Interactions between substances.

* The distinction between presence and causation.

* Analytical techniques and laboratory processes.

A central principle emerges: a toxicology result is not self-explanatory. Concentration must be interpreted within clinical context, medical history, and pathological findings.

We also address:

* Endogenous versus exogenous substances.

* False positives and contamination.

* The complexity of mixed drug toxicity.

* The medico-legal wording of toxicology findings.

Forensic toxicology requires restraint as much as science. Numbers must be translated into meaning without exaggeration.

Key Takeaways

* Toxicology interpretation requires contextual analysis.

* Post-mortem redistribution can alter concentrations.

* Therapeutic levels may be fatal in vulnerable individuals.

* Mixed drug toxicity is common.

* Laboratory accuracy and chain of custody are critical.

* Presence does not equal cause.

This episode highlights how forensic medicine reads the invisible chemistry of death.

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