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Fingerprinting ivory

ivory

Example of an elephant ivory tusk covered with fingerprints enhanced using a range of different powders.

Scientists from King’s College London and University College London have collaborated with imaging and fingerprint experts from the Metropolitan Police to validate the use of new techniques for retrieving fingerprints from ivory for the first time.

The findings, published in the journal Science and Justice, could lead to wider use of fingerprinting methods in the field to more easily identify poachers in regions with high levels of ivory-related crime.

Ivory has previously been considered a difficult material to obtain fingerprints from and such techniques have not been commonly used when illegally sourced ivory has been seized despite fingerprinting being one of the oldest, simplest and most cost-effective forensic tools.

Ivory itself is a highly porous, ridged material and fingerprints enhanced with conventional powders have been largely ineffective as a result. This presents a significant challenge for police and forensic experts to develop the level of fingerprint detail required for an accurate identification.

However in recent years, newer powder materials have emerged for fingerprinting. These are composed of smaller particles, which allow for more detail to be observed as they adhere better to smaller amounts of fingermark residue left behind.

The latest study tested three types of powders on three seized elephant tusks loaned by the Metropolitan Police Service’s Wildlife Unit. Those involved in the study compared two of the new powders to a more traditional powder using a variety of tests.

The team found that the newer reduced-size powders were able to provide clearer, useable fingerprint detail that is vital for identifying the donor. Reduced size powders stuck more easily to remaining fingermark residues than the more traditional powders, despite the ridged and porous nature of the ivory surface.

fingerprinting ivory(Left) Electron micrograph of the new fingerprint enhancement powders; (Middle) a fresh fingermark enhanced on an unpolished ivory tusk; (Right) a 28-day old fingermark enhanced on ivory.

The clarity of ridge detail was found to be at its highest within seven days after the print was deposited, suggesting the method would work best in regions of the world that are closest to the sources of ivory.

However, imaging and fingerprint experts were also able to lift some useable prints up to 28 days after they were deposited using the new powder. The researchers also showed its applicability to rhino ivory, hippo teeth and sperm whale teeth.

Study author, Dr Leon Barron, a Senior Lecturer in Forensic Science in the Division of Analytical and Environmental Sciences at King’s College London, said: ‘This is the first time that fingerprinting on ivory has been thoroughly investigated and a practical solution offered. The only other study carried out over a decade ago simply showed that fingerprints were unstable and that the clarity of ridge detail was low making it difficult to make reliable identifications. Our study has shown for the first time that these newer powders could potentially be used for identifying poachers, and are especially suited to rangers working in the field.’

Director of Forensic Services at the Metropolitan Police, Mr Gary Pugh OBE, said ‘The concept for this work was originally devised by an imaging expert based on his experience at crime scenes. The application has been developed into a viable front line evidence recovery technique through our Strategic Alliance with King’s College London. The equipment required to put this form of fingerprinting into practice is inexpensive and relatively easy to procure, making it a simple, cost-effective forensic tool to combat wildlife crime.

Kelly Weston-FordKelly Weston-Ford recently graduated with Distinction from the MSc in Forensic Science degree at KCL. Originally from South Africa, Kelly undertook a BSc in Biological Sciences and an Honours degree in Cellular Biology at the University of KwaZulu-Natal in Durban. She was subsequently awarded a prestigious Commonwealth Scholarship to pursue her passion for Forensic Science at KCL. Her research project on retrieval of fingermark ridge detail from ivory was one of approximately ten funded projects run annually under KCL’s Strategic Alliance research partnership with the Metropolitan Police Service and who subsequently named her ‘Student of the Year’ in 2014. She has since returned to South Africa and is currently working in the area of molecular diagnostics.

Barron, LeonDr Leon Barron is a Senior Lecturer within the Division of Analytical & Environmental Sciences and the Dept. Pharmacy & Forensic Science. He co-leads the MSc in Forensic Science programme and is responsible for delivery of forensic chemistry content. He also arranges >30 research projects for these students every year which are often run in collaboration with industry and academic partners across the globe. His research focus is mainly on analytical chemistry and its application in forensic and/or environmental science. Aside from this particular project, he is the principal investigator on several other RCUK, UK Government and industry-funded research projects focussing on, for example, the occurrence, fate and effects of drugs in the environment and trace detection of explosives in fingermarks, soil, water and air.

 

Notes to editors

For further information please contact Hannah Pluthero, Press Officer at King’s College London on 0207 848 3238 or hannah.pluthero@kcl.ac.uk

(Or duty press officer, evenings and weekends: +44 (0)771 146 6702)

‘The retrieval of fingerprint friction ridge detail from elephant ivory using reduced-scale magnetic and non-magnetic powdering materials’ by Weston-Ford et al is published online in the journal Science and Justice on Monday 2 November 2015. DOI number: 10.1016/j.scijus.2015.10.003

Guidance on how to retrieve fingerprints from ivory can be found in the supplementary information section of the paper and in a supporting video available from the authors or the King’s press office.

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