Title: If Bryan Kohberger is innocent, how did his dad’s DNA end up on the knife sheath?

We know that the only DNA found on the knife sheath at the crime scene was BK’s traced through his father and confirmed by a cheek swab.

If BK is innocent, how could his DNA have gotten there? That’s my question.

If the sheath had been touched by multiple people before the crime, wouldn’t their DNA also be on it? If BK had recently touched something that had his DNA on it—like his own clothes, a shared object, or a surface—and then someone else handled the sheath, they could have transferred his DNA onto it. However, forensic experts usually argue that secondary transfer doesn’t typically leave a strong enough DNA profile to be the only one detected, especially on an object like a snap button. Wouldn’t secondary transfer be too weak to leave a clear DNA profile?

Could lab contamination be possible, even though only one DNA profile was found? contamination usually results in mixed DNA profiles, not just a single clean source, so this is unlikely unless there was a serious mishandling of evidence.

The Sheath Was in His Possession at Some Point (But Not at the Crime Scene)- but if this is likely we would have heard it come out somehow through the defense in my opinion unless this is what us under gag order.

If BK didn’t commit the murders, what’s the most plausible way his DNA got on the sheath? Looking for logical explanations.