Ballistics Evidence in Wildlife Poaching

In a fresh poaching carcass, the wound track is still readable. A veterinary pathologist or forensic veterinarian conducting a field necropsy measures the entrance wound diameter and shape, traces the permanent cavity through successive tissue layers, and attempts to recover the projectile if it has not exited. The diameter of the permanent cavity in uniformly dense tissue (liver, muscle) correlates with bullet calibre, though velocity, bullet construction, and fragmentation complicate the relationship.

Entrance and exit wound characteristics carry further information. A high-velocity rifle round entering from range typically produces a relatively small, regular entrance wound and a larger, irregular exit. A shotgun at close range produces a spread pattern. A large-bore rifle at very close range (the typical elephant poaching weapon in eastern and southern Africa) produces entrance damage out of proportion to the projectile diameter, caused by muzzle blast hydrostatic shock. These patterns help establish calibre class and range even without a recovered bullet.

A rifled barrel has two sets of surfaces: the lands (the raised helical ridges) and the grooves (the channels between them). As the bullet is driven down the barrel, the lands engrave the bullet's softer metal (or jacketing), leaving striation marks. The number, width, and twist direction of the land-and-groove impressions are class characteristics: they narrow the bullet to a type of firearm. The microscopic irregularities in the striations are individual characteristics: they can, in principle, link a specific bullet to a specific barrel.

Comparison is done on a comparison microscope, which displays the evidence bullet and a test-fire bullet in a split field. The examiner aligns corresponding lands and looks for the striation pattern to match continuously across the split. A conclusion of 'identified' (fired from the same barrel) requires that the pattern matches in the examiner's judgement as well as any two bullets fired from that barrel match each other. The AFTE (Association of Firearms and Toolmark Examiners) theory of identification formalises this judgment as a threshold of pattern agreement.

Fragmentation is the most common obstacle in wildlife cases. Heavy bone (elephant skull, rhino horn base) fragments expanding-tip bullets aggressively. A fragment may carry usable striations on one face and be unexaminable on the other. Examiners report partial comparisons honestly, noting what surfaces were evaluable and what the fragment's condition was, rather than forcing an identification or exclusion from poor material.

When a firearm ejects a spent case, that case carries the impressions of several mechanical components. The firing pin leaves a characteristic depression in the primer. The breech face (the surface behind the case head) leaves a mirror impression in the soft brass. The extractor leaves a gouge on the case rim, and the ejector leaves a corresponding mark. These four marks combined form a pattern as individual as the rifling marks on a bullet, and they survive in much better condition because the case does not pass through tissue.

In remote anti-poaching scenes, casings are often found in grass or soil, where they may have been trampled or corroded. Cleaning is done carefully to remove debris without abrading the marks. Photography before cleaning records the as-found condition. A casing that cannot be identified to a specific firearm may still yield calibre class and extraction-mark class, which narrows the weapon type. Even that narrowing is useful when combined with wound-track calibre estimates.

In countries where problem-animal control is legal (much of southern and eastern Africa), a firearm-killed elephant does not automatically mean a crime. Crop-protection permits authorise farmers to shoot problem elephants under defined conditions: the animal must be in a crop field, the shooter must hold a permit, and in some jurisdictions a government wildlife officer must supervise. The forensic evidence must be interpreted against that legal framework, not just against the biology.

• Location: a kill inside a protected area boundaries is very hard to frame as crop protection. GPS coordinates of the kill site relative to park boundaries are a primary exhibit.
• Shot placement: a brain shot or heart shot from a practised angle suggests a deliberate, skilled kill. Random wounding does not.
• Firearm type and calibre: poaching syndicates in southern Africa favour specific calibres (commonly .375 H&H or .458 Winchester Magnum for elephants, 9.3x62 for rhinos) because these are what they can source. A calibre outside this pattern does not rule poaching in or out, but it is context.
• Licence and permit records: a legally registered firearm in the hands of a permit holder changes the interpretation of the same physical evidence. Ballistics alone cannot establish illegality; the documentary record must be checked.

Crossbows and traditional bows are used in poaching where firearms attract too much attention or are not obtainable. They are common in bushmeat hunting throughout sub-Saharan Africa, and crossbows have been documented in rhino poaching cases in southern Africa. The forensic examination combines elements of ballistics and toolmark analysis.

• Class characteristics: bolt or arrow head type (broadhead, field point, judo point), shaft material and diameter, fletching pattern, and nock type narrow the equipment category. Mass and spine stiffness relate to draw weight.
• Individual marks: the crossbow's arrow rest, rail groove, and cock-vane guide leave marks on the shaft and the flight vanes. In repeated-use weapons these marks become reproducible. Comparison between an evidence bolt and test-fires from a recovered crossbow follows the same logic as bullet comparison.
• Trace evidence on the shaft: blood and hair on a bolt recovered from a suspect's vehicle can be typed for species and individual DNA, directly linking the bolt to a specific animal.

IBIS (Integrated Ballistics Identification System), developed by Forensic Technology Inc. and deployed across multiple southern African national law-enforcement agencies, stores 3D surface images of fired bullets and cartridge cases. When anti-poaching investigators submit casings from a rhino kill, the exhibits are imaged and entered. The system compares them algorithmically against thousands of existing records and ranks candidate matches by similarity score. Human examiners then review the top candidates on a comparison microscope.

In practice, IBIS has produced geographic and temporal weapon-use maps in southern Africa that would have been invisible without database linkage. A firearm used in a rhino kill in Limpopo in March may appear again in a buffalo kill in Mpumalanga in July. The linkage tells investigators that the same syndicate operated in both provinces, which is intelligence the individual cases could not provide. IBIS data has been used as prosecution evidence in South African wildlife courts to demonstrate a pattern of criminal use of a specific firearm.