When customs officers in Durban seize a shipment of 500 kg of dried pangolin scales, the immediate questions are practical and legal: what species, from where, and who is responsible? Two decades ago, these questions could rarely be answered with enough precision to support a prosecution. Today, wildlife forensic science — built on DNA analysis, stable isotope chemistry, and population genetics — can address each one with increasing confidence. Pangolins have become a focus of forensic development precisely because they are the world's most trafficked mammal and because the evidentiary standards required to convict traffickers demand that enforcement agencies bring scientific rigour to bear.
The first and most fundamental forensic question is species identity. This matters legally because the eight pangolin species have different CITES listings and are protected under different national legislation in source, transit, and destination countries. It matters scientifically because trafficking patterns, demand drivers, and source populations differ between species.
All eight pangolin species can be reliably distinguished using mitochondrial DNA markers, particularly sequences from the cytochrome b gene and the control region. Crucially, this identification works not only from fresh tissue but from processed products: dried scales, powdered scale material, and even cooked or dried meat retain sufficient DNA for PCR amplification and sequencing. Labs at the Wildlife Forensic Academy, South Africa's South African National Biodiversity Institute (SANBI), and equivalent facilities in Asia have validated these methods against reference collections representing the full range of pangolin diversity.
Species identification from scales is particularly valuable because scales are the most commonly seized product — both for the traditional medicine market and as a proxy currency in wildlife crime networks. A kilo of dried scales can be unambiguously assigned to species within 48 hours at a competent forensic facility, using minimal sample material.
Species identification tells investigators what was taken. Geographic assignment tells them where it was taken from — a critical link in building cases against trafficking networks that operate across multiple jurisdictions.
Geographic assignment relies on the fact that pangolin populations across different regions accumulate distinct genetic signatures over generations of limited dispersal. By comparing allele frequencies at multiple microsatellite loci or single nucleotide polymorphism (SNP) positions in a seized individual against a reference database of genotyped animals from known locations, forensic geneticists can assign the individual to a source population with quantifiable probability.
For ground pangolins in southern Africa, reference databases developed through tissue sampling at rehabilitation centres and from wild-caught animals being fitted with satellite tags now include hundreds of individuals from locations across South Africa, Zimbabwe, Botswana, Mozambique, and Zambia. Assignment to broad regional populations — northern Limpopo versus KwaZulu-Natal coastal areas, for example — is achievable with current databases. Finer-scale assignment within a province remains statistically challenging without denser sampling.
A complementary approach uses stable isotope ratios (particularly carbon-13/carbon-12 and nitrogen-15/nitrogen-14) preserved in scale tissue to infer the biogeochemical environment where the animal fed. Isotope signatures reflect local soil chemistry, vegetation type, and geology in ways that vary systematically across landscapes. Combined with genetic assignment, isotope analysis can triangulate origin more precisely than either method alone, and it is independent of reference database coverage gaps.
Isotope analysis has been applied to confiscated African elephant ivory and rhinoceros horn for over two decades, and the methodology is now being adapted for pangolin scales with promising early results from collaborative work between South African and UK forensic institutions.
One underappreciated application of wildlife forensics is linking seizures to each other or to previously known individuals. If scales from a seizure in Johannesburg match DNA from a live animal that was previously rehabilitated and released in Limpopo, investigators have a direct chain of evidence connecting a specific poaching event to a specific individual. Individual identification using genetic profiling also allows investigators to determine whether multiple seizures came from the same source population, suggesting a coordinated poaching operation rather than independent opportunistic events.
This approach has been used in rhinoceros forensics in South Africa — where a national DNA database of individual rhinos allows seized horn to be matched to individual animals and specific reserves — and the same principle is being extended to pangolin forensic programs.
DNA evidence is only useful if it meets the evidentiary standards of the jurisdictions where prosecution occurs. In South Africa, forensic wildlife evidence must follow established chain-of-custody protocols and be produced by accredited laboratories for it to be admissible in terms of the National Prosecuting Authority's requirements. CITES Appendix I species, including all pangolins, require particularly rigorous documentation.
The African Pangolin Working Group and SANParks Scientific Services have worked with the NPA to develop standardised evidence-collection protocols for use by rangers, customs officers, and police — ensuring that samples collected at point of seizure are handled in ways that preserve DNA integrity and maintain legal chain of custody. Training in these protocols has been extended to customs officers at major ports of entry, particularly OR Tambo International Airport and the ports of Durban and Cape Town, which handle the majority of pangolin seizures in South Africa.
Geographic assignment is only as good as the reference database. For Central and West African pangolin species — particularly the giant pangolin and the tree pangolins — reference sampling is sparse. Most sampling effort has concentrated on southern African ground pangolins and Asian species, reflecting where the most active research programs operate. Expanding reference databases across the full range of each species is a recognised priority.
DNA degrades under heat, humidity, and chemical processing. Scale material that has been boiled, bleached, or chemically treated to enhance appearance for the traditional medicine market may yield insufficient DNA for reliable profiling. Researchers are developing low-template amplification methods and alternative molecular markers that perform better under degraded conditions, but this remains an active challenge.
An emerging frontier is environmental DNA (eDNA) — detecting pangolin presence from soil, water, or air samples at suspected poaching sites or trafficking nodes without needing to find the animal directly. Early proof-of-concept work has demonstrated that pangolin DNA persists in burrow soil for several months and can be amplified and identified from these environmental samples. This opens the possibility of forensically confirming poaching activity at a location even after the animal and poachers have gone.
South Africa has invested substantially in wildlife forensic capacity over the past decade, driven largely by the rhinoceros poaching crisis. This infrastructure — including the National Forensic Science Laboratory and SANBI's genomics resources — is directly applicable to pangolin forensics. The African Pangolin Working Group actively collaborates with these facilities, and South Africa is positioned as a regional hub for pangolin forensic analysis serving neighbouring countries where laboratory capacity is limited.
Can DNA testing identify which pangolin species has been seized?
Yes. All eight pangolin species can be reliably distinguished using mitochondrial DNA markers, including from processed products such as dried scales and traditional medicine preparations.
Can DNA trace where a trafficked pangolin came from?
Geographic assignment is possible at the population level. Reference databases for ground pangolins across southern Africa are now detailed enough to assign individuals to broad regional populations.
How are pangolin scales tested in forensic labs?
DNA is extracted from the scale root, where keratinised cells retain sufficient nuclear or mitochondrial DNA for PCR amplification. Scales can be tested even after years in storage.
Which countries have used pangolin DNA evidence in court?
South Africa, Vietnam, Malaysia, and China have all used DNA forensic evidence in wildlife crime prosecutions.