Last year a forensic study broke new ground by proving there’s usable human DNA in cat fur which can prove a person was in a home or interacted with a particular pet.
Now a new study looked at the opposite situation, establishing that a single cat hair on a person’s clothes can tie them back to an individual cat — and the scene of a crime.
The general public, criminals included, are more aware of DNA and forensic techniques than they’ve ever been thanks to ubiquitous police procedurals, some of which focus heavily on the investigation and evidence-gathering aspect of police work.
But even the most fastidious criminal who is careful not to leave a single print or strand of his own hair at a crime scene can be undone by cat fur clinging to clothes. In fact it’s almost impossible for a person to spend more than a few minutes inside a cat-occupied home without picking up at least some fur, the research team said.
The paper, published this month in Forensic Science International: Genetics, outlines a new method for sequencing genetic information found on strands of cat fur.
“Hair shed by your cat lacks the hair root, so it contains very little useable DNA,” said Emily Patterson, the paper’s lead author.
Previously it wasn’t possible to narrow down with certainty whether a strand of hair belonged to a particular cat, but the research team found a new way to resequence DNA in a way that can link it to individual felines. The team’s new method doesn’t require any additional hair or roots, solving the original problem.
To prove their method works, they extracted fur from the body of a deceased cat and were able to match it to her surviving brother.
“In criminal cases where there is no human DNA available to test, pet hair is a valuable source of linking evidence, and our method makes it much more powerful,” said Mark Jobling, a geneticist at the University of Jobling and co-author of the new study. “The same approach could also be applied to other species — in particular, dogs.”
While dog hair can potentially be used in the same way, cat hair may have more forensic value from a prosecurorial standpoint because cats are territorial and many don’t leave their homes. It’s much easier to prove a suspect was inside a home if he or she is linked to an indoor-only cat than if the suspect’s clothes have fur from a dog who is walked around the neighborhood a few times a day.
Pain In The Bud 