Bryan Kohberger was tied to the crime scene by a knife sheath that he allegedly left at the house after the murders. The authorities were able to gather the DNA from the button and use that DNA to track it back to Bryan Kohberger.
In this episode, we hear from some more experts who discuss how likely it it is that Bryan Kohberger left additional DNA at the crime scene, besides what was announced in the affidavit.
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source:
Bryan Kohberger May Have Left More DNA at Idaho Murder House—Expert (msn.com)