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I think he had a flashlight in his mouth. It's possible he put dna on his hand when he removed it.IF the perp did leave behind dna (taking samples from hired help suggests he did). I wonder what the source is. The person in the cctv footage seems quite well covered. I would’ve been surprised if Nancy put up a fight given her mobility issues and the fact the perp has a gun. Did they leave behind something like BK?