Saturday, December 7, 2019
Shaking Hands Transfers DNA to Things You've Never Touched
The fact that DNA is transferred from a handshake between two people is a given, but DNA appearing on objects and surfaces that a person didn't even touch according to new studies. This is pretty interesting discovery because this will cause crime scene investigators to consider DNA transfer when swabbing areas of a crime scene and determining suspects. Cynthia Cale, a forensic scientist, had previously found that shaking someone's hand for 2 minutes can transfer a persons DNA to an object by way of another person. The only issue with this discovery is that it is a little bit unrealistic because a 2 minute handshake would just be too awkward. However, she did another study and narrowed it down to a 10 second handshake. This is still a pretty awkward handshake, but the DNA is still able to be transferred during this very short time frame. Cale did a study to simulate a crime scene. She had two people shake hands for 10 seconds, then she had one of those people grab a knife. It was found that a majority of the DNA found on the knife was from the person that wasn't even touching the knife. I find this to be extremely interesting because there could potentially be discrepancies in crime scene investigation, and this could complicate a detectives ability to investigate a crime.
Original Article: https://www.sciencenewsforstudents.org/article/long-handshake-spreads-your-dna-things-never-touched
Supporting Article: http://www.evidencemagazine.com/index.php?option=com_content&task=view&id=2159&Itemid=41