Police in Tasmania have used a blood sample from a leech to identify a criminal, in what is believed to be a world forensic first.
Eight years ago, a group of thieves robbed 71-year-old Fay Olson in her home.
Police found a leech at the crime scene and took a sample of the blood it had consumed for DNA profiling.
In 2008 Peter Alec Cannon was charged over an unrelated drug offence and his DNA was found to match the sample.
Cannon has now admitted aggravated armed robbery.
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