They need the actual DNA to do a genealogy search. A SNP profile, or a full profile. They could however do a Familial DNA Search by reclassifying the case to “cold”. That would allow partial matching within the CODIS
So you'd be looking for partial matches of a profile which is already partial. Then you would winnow down to suspects who were in Boulder at the right time and who did not have a decent alibi? You would already know they were bad guys because they're in CODIS so the cause would be righteous. Sounds pretty good, on the surface at least. But if the search broadens to family members, it might implicate innocent men who will find it hard to prove their innocence 25 years later.
I'm not much interested in the DNA because to my satisfaction Patsy is the author of the ransom note. What if the DNA belongs to someone who visited the house, even that day? It might be a 10-year-old kid who came over to play with Burke. Maybe Patsy touched the rim of a glass he'd drunk from--with a gloved hand--after which she proceeds with the rest of it: Pulling down the long johns, breaking the paintbrush, etc. She'd know he wasn't in CODIS so no worries. That seems possible.
(I want to be clear that I'm not suggesting Burke or any other little boy did anything.)
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