Without a trace? Not anymore…

by ZSL on

The crime scene can be as small as a pangolin scale or as light as a feather, but thanks to ground-breaking new research from ZSL, wildlife criminals will soon have nowhere to hide.

Photo - UV light shining on turtle shell, revealing a hand-print

In this Q&A session, ZSL researchers Louise Gibson and Alex Thomas reveal how they’ve swapped their lab coats for trench coats, tackling the illegal wildlife trade with some very CSI-style detective work…


ZSL is using some very surprising tools to tackle the illegal wildlife trade – how did this all start?

Alex: In 2018, ZSL partnered with the University of Portsmouth to trial the lifting of fingerprints from the smuggled scales of pangolins - the most illegally-trafficked mammal on earth. The trial - which involved working with samples as small as an inch long - was a success, creating a new wildlife crime investigation tool to help combat the poaching and trafficking of wild animals

We decided to take the pangolin scale trial one step further and use the latest in modern forensic techniques to try to extract human DNA from three smuggled items; a crocodile skin bag, an ivory hair comb and a bird feather – all of which were confiscated by UK Border Force after being illegally brought into the country.

Louise: Alex knew that my background prior to joining ZSL was in police forensics, which meant I was well versed in crime scene investigation - she invited me to support the project and I thought it would be fun to dust off my forensic hat and apply it to my current working environment, so I agreed to get involved!

How did you go about the trials? 

Louise: ZSL volunteers handled the items, depositing fingerprints and DNA in the process, and after experimenting with different DNA extraction techniques, we worked with Liverpool John Moores University on the analysis and were able to produce a complete profile for matching, which was very encouraging. 

Alex: We also trialled a new form of fingerprint lifting, using something called a Forenscope, borrowed from forensic service providers Scenesafe: It’s portable, discreet and doesn’t require the use of powders which can leave conspicuous traces – perfect for on-the-ground analysis in what are quite often dangerous environments. This also had positive results, so our arsenal of wildlife crime-fighting tools is now growing.

Photo - ZSL researchers, Alex and Louise, demonstrating a UV fingerprint camera in the lab
Alex Thomas (left) and Louise Gibson (right) demonstrate the UV fingerprint camera on a turtle shell

How will this tackle the issues surrounding the illegal wildlife trade?

Alex: There are so many different forensic techniques available for investigators examining traditional crime scenes, but lifting fingerprints and DNA from small pieces of organic material filled with ridges and bumps takes a lot of trial and error to see what works best. 

Turtle shells, crocodile skins, rhino horn – they’re all unique crime scenes in their own right, so it’s a matter of adapting the methods used in traditional forensics to discover what would work best for each, especially in the challenging environments ZSL’s wildlife crime-fighters operate in.

What are your hopes for the future?

Photo - Clive Cookson, fromo the Financial Times, examining some seized wildlife products
Financial Times science editor, Clive Cookson, examining some of the test items.
Alex: The project is very much ongoing – we need to find the best forensic methods to lift fingerprints and extract DNA from each specific trafficked item, so that these techniques can be deployed all over the world. The most effective DNA extraction method for a pangolin scale will be different to the one that works best on an elephant’s tusk.

Louise: ZSL works across the world creating and deploying new technologies and rolling out in-country training to combat the illegal wildlife trade. To be able to, for example, supply forest rangers and border force personnel with a toolkit that can be discreetly, quickly and cheaply used in on-the-ground investigations - without leaving a trace - will be a vital part of tackling this well-organised criminal enterprise. These tools already exist, so adapting them for tackling the illegal wildlife trade is the obvious next step.

Alex: By building up a detailed bank of fingerprint and DNA analysis, and by sharing this with forest guards, police forces and customs officials around the world, we can start to build up a picture of smuggling routes, the number of people involved and the key individuals taking part: this kind of intelligence gathering will be the key to finally breaking down these networks, which are threatening to wipe out critically endangered species across the globe. 

Louise: There’s more research to be done, but with so many of our collaborators as committed to tackling the issue as we are, we’re confident that one day there will be nowhere for these criminal enterprises to hide. 

Your donations help us tackle a range of threats to wildlife across the world through science, education and conservation.
In addition, between 1 October and 31 December 2019 the amount you donate will be matched by the UK government – up to £2million. This match-funding will be used to help communities in Nepal and Kenya build sustainable livelihoods, escape poverty and protect their wildlife.


Donate Now

Select a blog

Careers at ZSL

Our people are our greatest asset and we realise our vision for a world where wildlife thrives through their ideas, skills and passion. An inspired, informed and empowered community of people work, study and volunteer together at ZSL.

Nature at the heart of global decision making

At ZSL, a key area of our work is the employment of Nature-based Solutions – an approach which both adapt to and mitigates the impacts of climate change. These Solutions, which include habitat protection and restoration, are low-cost yet high-impact, and provide multiple benefits to people and wildlife. We ensure that biodiversity recovery is at the heart of nature-based solutions. 

ZSL London Zoo

A blog for lovers of ZSL London Zoo, bringing you extraordinary animal facts and exclusive access to the world's oldest scientific zoo.

ZSL Whipsnade Zoo

Do you love wildlife? Discover more about our amazing animals at the UK's biggest zoo!


We're working around the world to conserve animals and their habitats, find out more about our latest achievements.


From the field to the lab, catch up with the scientists on the cutting edge of conservation biology at ZSL’s Institute of Zoology.


A day in Discovery and Learning at ZSL is never dull! The team tell us all about the exciting sessions for school children, as well as work further afield.

Artefact of the month

Every month, one of the pieces held in ZSL’s Library and at ZSL Whipsnade Zoo will feature here as Artefact of the Month.

Wild About

Read testimonials from our Members and extracts from ZSL's award winning members' magazine, Wild About.

Asia Conservation Programme

ZSL works across Asia, from the famous national parks of Nepal to marine protected areas in the Philippines. Read the latest updates on our conservation.

Remote Sensing in Ecology and Conservation

An Open Access journal for research at the interface of remote sensing, ecology and conservation.