/

How the dirt on your shoes could prove your guilt

This video from Nature (via Lady Scientists of Tumblr) looks at the work of forensic geologist Lorna Dawson, who has pioneered methods to convict criminals from the dirt on their shoes.

Lorna takes us to a mock crime scene to show how she tests new techniques in soil forensics.

Soil forensics is not new, as Nature notes.

Forensic soil science was nearly 150 years old by the time Dawson took it up. Police in Germany used sandy soil to solve a crime in 1856 and Arthur Conan Doyle noted the forensic potential of dirt three decades later in his first Sherlock Holmes mystery, A Study in Scarlet. In the story, Watson says that Sherlock “tells at a glance different soils from each other. After walks, has shown me splashes upon his trousers and told me by their colour and consistence in what part of London he had received them.”

But the science remained fairly static until recently when a few scientists, such as Dawson, started using sophisticated techniques such as specialised scanning electron microscopy for mineralogy. Dawson plans to add microbial DNA profiling to her armoury.

Bill Condie

Bill Condie

Bill Condie is a science journalist based in Adelaide, Australia.

Read science facts, not fiction...

There’s never been a more important time to explain the facts, cherish evidence-based knowledge and to showcase the latest scientific, technological and engineering breakthroughs. Cosmos is published by The Royal Institution of Australia, a charity dedicated to connecting people with the world of science. Financial contributions, however big or small, help us provide access to trusted science information at a time when the world needs it most. Please support us by making a donation or purchasing a subscription today.