Leech Convicts Australian Robber

Police found a leech at the scene of a robbery in Tasmania eight years ago. They took a sample of the blood the leech had consumed. In 2008, Peter Alec Cannon was arrested on an unrelated drug charge. The DNA from his blood matched the blood from the leech!
Cannon would probably have got away with the crime had he not been charged with drug offences late last year, and asked to give a DNA sample - which matched that from the crime scene.

Detective Inspector Mick Johnston, who was involved in the police investigation from the start, said Cannon's conviction validated the use of DNA technology.

"It's a testament to DNA evidence and the legislation that allows us to keep such evidence in relation to unsolved crimes - this is a fantastic result," he said.

Link -via Boing Boing

(image credit: BBC)

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I don't know the full details of the story, but wouldn't that be circumstantial evidence? Is there any proof that the leech came from the perpetrator of the initial crime?
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