In the Idaho murders case, a single button from a knife sheath yielded single-source male DNA, suggesting the suspect, Brian Coberger, likely wore gloves but handled the sheath earlier. While this DNA was not found in criminal databases, it was sufficient for genetic genealogy analysis, potentially involving private labs and the FBI's investigative team.

Impact: High. This critical piece of DNA evidence, though small, initiated the genealogical investigation that led to the identification of Brian Coberger, highlighting the power of even minimal genetic traces in modern criminal investigations.

In the source video, this keypoint occurs from 00:39:50 to 00:42:24.

Sources in support: Megyn Kelly (Host)