Investigations into the circumstances surrounding the death of David Kelly have led to the exchange of acrimonious views including allegations of conspiracy and murder. David Kelly, a government scientist and weapons expert, committed suicide by cutting his wrist and taking painkillers after he was identified in newspapers as the man the UK government believed was the source for a BBC report on Iraq. Impetus for the debate stems mainly from conflicting views about the cause of death, including issues that relate to postmortem toxicology results and their interpretation. Controversy occurs from the mistaken notion that postmortem laboratory measurements, taken in isolation, can be interpreted effectively.

The current controversy illustrates some universally held, but mistaken, notions about the process of death investigation in the United Kingdom and elsewhere. Many assume that forensic pathology is as evidence based as other branches of medicine. This assumption is …