Posted yesterday, hope it eases your mind.
It's just a time waster. Note They didn't say "prints"...DNA evidence
Now, if this same DNA EVIDENCE, was also found in the garage, house etc...that's a whole another story, but this is meaningless IMO. Just doing their job.
..."Humans
shed DNA continuously, and shed DNA transfers freely between people and objects. DNA can be transferred through a handshake or touching an inanimate object, like a doorknob. Every time you shake someone's hand you might receive some of your acquaintance's DNA, and that of other people..."
..."Similarly,
a person identified by a match of DNA discovered at a crime scene may have never come into contact with the object or the person on which his DNA was found. Yet, modern day high-tech CSI investigations do not account for the possibility that the evidence discovered at a crime scene was deposited via touch-transfer"....
(this article is 2 years old...hopefully people are more up to speed)
Framed By Your Own Cells: How DNA Evidence Imprisons The Innocent