March 16, 2010
Hand Bacteria Could Help Forensic Scientists
A new study has revealed that the existence of "personal" hand bacteria, as unique as a person's fingerprints and DNA, could become the latest weapon for forensics experts in their attempts to solve crimes and identify victims.
According to a press release, the researchers at the University of Colorado at Boulder who conducted the study "swabbed bacterial DNA from individual keys on three personal computers and matched them up to bacteria on the fingertips of keyboard owners, comparing the results to swabs taken from other keyboards never touched by the subjects. The bacterial DNA from the keys matched much more closely to bacteria of keyboard owners than to bacterial samples taken from random fingertips and from other keyboards."
Fierer and his research team state that the technique is currently between 70 and 90-percent accurate, but note that they expect the accuracy rate to increase as better, more precise technology becomes available to forensic laboratories.
A previous study by Fierer showed that the average human hand is home to approximately 150 different species of bacteria, and that "only 13 percent of bacteria species found on a single hand were shared by any two people," according to the CU-Bolder media release.
The study was funded by the National Science Foundation, the National Institutes of Health, the Crohn's and Colitis Foundation of America and the Howard Hughes Medical Institute.
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