That's the first I've heard that there's half a dozen markers in common between the underwear and nail dna. I wish we could get a probability value of them being a match. Is it true that the dna is caucasian? - or is that mixed up with the hair being caucasian.

Isn't there a database of unidentified dna that was found in crime scenes? - I can't believe there wouldn't be. Dna is compared to a database of known sex criminals, it seems it would also be valuable info just to know that the same perp committed 2 different crimes, even if they don't know his identity.