Senior-clinician companion to introductory Forensic Medicine notes. Educational use only. Laws and procedures vary by jurisdiction; use current local legal guidance and authorised forensic services.
A Word From Your Senior
The forensic doctor's duty is not to help one side win. It is to observe carefully, preserve evidence, explain limitations, and respect the dignity and rights of every person, living or dead.
Observation Before Interpretation
Document identity checks, consent or legal authority, date and time, who was present, history as attributed, examination method, positive and relevant negative findings, samples, seals, labels, transfers, and limitations. Distinguish:
- what the person reported;
- what you directly observed or measured;
- what records state;
- what you infer;
- how certain that inference is.
Use body diagrams and photographs only with proper authority, consent where applicable, secure handling, and scale/orientation. Avoid judgmental language.
Time Since Death and Injury Interpretation
Postmortem cooling, lividity, rigor, decomposition, entomology, and biochemical changes are affected by environment, clothing, body size, illness, activity, and many other variables. They support an estimated interval, not an exact clock time.
Wound appearance may help assess mechanism, direction, vitality, and age, but overlap is common. Do not infer intent, weapon, or precise timing beyond what findings support. Clinical treatment takes priority in living patients; evidence collection must not delay emergency care.
Toxicology
Toxicological interpretation requires specimen identity, chain of custody, matrix, timing, analytical method, metabolites, tolerance, redistribution, interactions, and clinical or postmortem context. Detection does not automatically establish impairment or cause of death.
Bedside Case
A person reports assault but has no visible injury. Record the account neutrally, assess and treat urgent needs, offer safeguarding and relevant specialist pathways, document the absence of visible injury without implying that assault did not occur, and follow jurisdictional consent and reporting law.
Accuracy Guardrails
- Never promise an exact time of death from one sign.
- Never diagnose poisoning from odour or colour alone.
- Preserve original notes; correct errors transparently under policy.
- Maintain confidentiality while complying with lawful disclosure duties.
- In court, stay within expertise, explain uncertainty, and say when an answer cannot be supported.
Trusted Starting References
- UN Manual on the Effective Investigation and Documentation of Torture (opens in a new tab)
- INTERPOL Disaster Victim Identification (opens in a new tab)
- Current national law, medical council guidance, and accredited forensic protocols.