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A leech found at a crime scene eight years ago led Australian police to a man who admitted robbing an elderly woman in 2001.

CANBERRA, Australia —  Blood extracted from a leech found at a crime scene eight years ago led Australian police to a man who admitted robbing an elderly woman in 2001.

A blood-full leech, the only forensic evidence found at a crime scene almost eight years ago led a group of Australian police to an armed robber, with the use of DNA technology.

Foresic science researcher Sally Keller said that a case as unique as this could be the first in which investigators and detectives have used DNA samples extrated from a bloodsucker.

According to investigators, the leech was the only forensic evidence Peter Canonn left behind, as he and an accomplice tied an elderly women to her chair in her home in Tasmanian woods, leaving with hundreds of dollars in cash.

They then indentified Peter Cannon as the culprit when his DNA profile was recorded by the authorities after being arrested last year on unrelated drug charges.

Cannon, now 54, pleaded guilty in the Tasmanian Supreme Court on 21, October 2009, to armed robbery. He will be sentenced on Friday and faces a possible maximum of 21 years in prison.

Until now, Australian are still looking for Cannon’s lost accomplice.