In what could prove to be a boost to forensic science while at the same time disheartening to criminals world over, researchers at the University of Colorado at Boulder have discovered that each individual possesses a unique bacteria 'fingerprint'.

A study that matched bacterial samples taken from computer mouse and keyboards with the users showed that the samples genetically matched the bacteria on the hands of the users more than those of randomly selected persons.

The deduction - that the colonies of bacteria that inhabit each person's hands are highly specific to the individual. Of about the 150 species of bacteria found on the average human hand, only 13 per cent are shared with other persons.

The technology though still in its nascent stage could one day be used in forensic analysis of crime scene investigations and as an independent method of confirming the fingerprint and DNA analysis.

The technique which at present has an accuracy rate of between 70 to 90 per cent is expected to improve as it becomes more sophisticated.

"Each one of us leaves a unique trail of bugs behind as we travel through our daily lives. While this project is still in its preliminary stages, we think the technique could eventually become a valuable new item in the toolbox of forensic scientists", stated lead author Noah Fierer of the University of Colorado.