Autopsy and Post-Mortem Examination Protocol

Indian forensic medicine recognises four categories of post-mortem examination, and treating them as interchangeable is a common mistake. The medico-legal autopsy is the only one that produces evidence admissible against an accused. The clinical autopsy is the only one that needs consent. The exhumation autopsy is the only one that needs a magistrate's written order before the dissection can begin. Virtopsy is the only one that produces a DICOM file instead of a tissue specimen.

The Indian anchor here is the medico-legal autopsy under BNSS Section 196 read with Section 198. The dissection is performed by a registered medical practitioner, in most large districts a Forensic Medicine specialist holding an MD in Forensic Medicine and Toxicology, in a government hospital mortuary. Private mortuaries are not authorised for medico-legal work. The IO's requisition, the inquest report (whether by police under Section 196 or by the Executive Magistrate under Section 198), the photograph of the body taken at the scene, and the body itself arrive together, and the surgeon should not start the external examination until all four are physically on the autopsy table.

By the time the surgeon picks up the scalpel, three things should already be done: the requisition and inquest report are read, the identity is verified against the inquest panch witnesses or the next of kin, and the clothing is photographed before any item is removed. Omitting any of these steps produces a report that is vulnerable to challenge at trial even when the dissection itself is technically correct.

The pre-autopsy sequence runs in a fixed order. It functions as a mandatory checklist.

1. Step 1
   Receive requisition under BNSS 196/198, inquest report, scene photographs and any seized articles accompanying the body.
2. Step 2
   Verify identity against panch witnesses or relatives present; record the verifying person's name and signature.
3. Step 3
   Note time of arrival of body at mortuary and time of commencement of examination separately.
4. Step 4
   Photograph the body fully clothed, with a case-identifier scale, from anterior, posterior and both laterals.
5. Step 5
   Describe each item of clothing in situ before removal: type, colour, fabric, blood-staining, tears, foreign matter. Collect each item separately, label, seal, and enter on the clothing receipt.
6. Step 6
   Repeat photography of the unclothed body, then proceed to external examination.

The external examination itself follows a layered protocol that is often treated as one block but which actually has five components. Sequence matters because each component contaminates the next if done out of order.

• General description. Apparent sex, apparent age, build, nutrition, complexion, posture on the table. The age estimate is a reasoned guess, not an assertion; the candidate who writes "age 35 years" instead of "apparent age 30 to 40 years" is teaching the defence to discredit the report.
• Identifying marks. Tattoos (described with location, size and content), surgical and traumatic scars, congenital deformities, amputations, dental peculiarities, occupational stigmata (mehndi stains, callouses, ink marks on writing finger). Each is photographed with scale.
• Post-mortem changes. Algor mortis (rectal temperature), rigor mortis (graded across jaw, neck, upper limb, trunk, lower limb), livor mortis (pattern, fixed or unfixed, colour). These are correlated with scene findings as covered in Thanatology: Death and Post-Mortem Changes.
• Injuries. Each injury described by type, site (anatomical landmark plus distance from a fixed reference), size as length × breadth × depth, shape, edges, age, direction. Documented on a body diagram and photographed individually with scale.
• Body orifice examination. Mouth, nose, ears, anus and external genitalia inspected for foreign material, discharge or injury. In suspected sexual offence cases this examination is performed by a woman doctor where possible, in the presence of a woman attendant.

The internal examination opens the three body cavities in a fixed sequence: head, thorax, abdomen. The pelvis is examined as a fourth region where the case demands it (suspected sexual offence, suspected criminal abortion, female deaths in custody). The neck is examined as a layered dissection in any case of suspected hanging, strangulation or throttling, and many Indian SOPs now mandate neck dissection in every unnatural death of a woman regardless of presentation.

A pragmatic note on order. The classical teaching is "thorax-abdomen-head", with the head opened last to avoid blood pooling distorting the brain. In Indian practice the surgeon usually opens the head first when there is any external head injury, to capture intracranial findings before transport-related artefact accumulates. Either order is defensible if recorded.

The reporting stage is where most autopsy reports lose evidentiary value. Each organ examined gets a weight (where weighable), a colour, a consistency, a cut-surface description, and a positive or negative finding statement. "Liver normal" is not a defensible entry. "Liver weighs 1,420 g, dark brown, firm consistency, cut surface uniform without focal lesion, no evidence of contusion or laceration" is.

The samples that leave the mortuary at the end of the autopsy are evidence in their own right, subject to the same chain of custody as anything seized at a scene. The viscera receipt is the autopsy's equivalent of the seizure memo. The forwarding memo travels with the jars to the State FSL, and the IO carries a copy back to the case file. The handling rules cross-link directly to the Chain of Custody protocol.

Each jar is labelled with the post-mortem number, the deceased's name, the body part, the preservative, the date and the surgeon's signature. The jars are sealed with cloth and lac, the surgeon's personal seal is impressed on the cloth, and the seal impression is reproduced on the viscera receipt. The defence will inspect the seal impression at trial; the chain-of-custody case law in Bharatiya Sakshya Adhiniyam: Forensic Evidence in Court makes a seal-impression mismatch fatal regardless of analytical result.

The post-mortem report itself has a standard five-block structure that every Indian forensic surgeon writes to: history (from the requisition and inquest), external findings, internal findings, viscera dispatched, and opinion as to cause of death. A provisional opinion is issued on the day where the cause is obvious (decapitation, massive haemorrhage, large bullet wound). A final report is issued only after the chemical analyst's report from the FSL comes back, sometimes weeks later. Many Indian poisoning cases collapse because the provisional opinion was treated as final and the final never reached the IO.

A second autopsy is requested when the first report is contested by the family, the accused, or the prosecution itself. The Supreme Court has held in a line of cases that the next of kin has a right to seek a second opinion where there are credible grounds, that the second autopsy should be performed by a panel rather than a single surgeon, and that the panel report carries equal evidentiary weight to the first if the second autopsy is technically competent. The second autopsy is also the procedural route for high-profile custodial deaths, where NHRC guidelines now strongly recommend videography of the entire second autopsy.

Exhumation autopsies are ordered for one of two reasons: a suspicion of poisoning that surfaces after burial, or the discovery of new evidence implicating a buried body in a crime.

1. Step 1
   IO files application before the Executive Magistrate, who orders exhumation under BNSS Section 197 read with Section 176.
2. Step 2
   Magistrate fixes date and time, and orders presence of forensic medicine specialist, IO, panch witnesses and a representative of the family.
3. Step 3
   Grave is identified by the cemetery custodian and a relative; identification recorded on panchnama before any digging.
4. Step 4
   Soil samples taken from above, around, and below the coffin or shroud, in separate containers, for comparison.
5. Step 5
   Body recovered, photographed in situ, then transferred to mortuary or a field tent for autopsy.
6. Step 6
   Autopsy follows standard medico-legal protocol; decomposition state recorded as a finding rather than treated as a limitation.
7. Step 7
   Viscera preserved in saturated NaCl as standard; soil samples accompany viscera to FSL.

The Indian anchor here is the Aarushi-Hemraj reopening, where the absence of a second autopsy was raised on appeal, and a string of dowry-death cases where exhumation produced poisoning findings (arsenic, organophosphate) that the original autopsy had missed. Exhumation is a routine procedural option where the original post-mortem report is incomplete or contested.

Virtopsy (CT and MRI-based virtual autopsy) is at the pilot stage in India. NFSU Gandhinagar runs a research programme; AIIMS Delhi and JIPMER have published on selected applications, particularly skull fractures and gunshot trajectories. The current Indian position is that virtopsy is an adjunct that supplements conventional autopsy, not a replacement. The procedural law (BNSS 196, 197, 198) speaks to a dissection rather than to imaging, and until the legislature or the Supreme Court speaks otherwise, the dissection remains mandatory in every medico-legal case.