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It's not just possible, but makes complete sense. Like I said, even with direct skin contact (which may not even be the case), there's no guarantee it would contain victim DNA. I would think it would be standard to swab the entire item, but the absolute best part to swab would be the part that required pressure to be applied in an intentional manner. You know that's going to be from the killer, as opposed to DNA on other parts of the sheath.All MOO
Isn't it something like humans shed 200,000,000 skin cells per day? Yet a sheath laying underneath a blanket and a victim only has what 20 skin cells ONLY in the button snap?
Is it possible? Maybe. But in my opinion it's nearly impossible unless the ONLY part of the sheath they actually tested was the button snap.
All MOO
The absence of DNA is not evidence of anything.