Here is what I think is the problem with the DNA sample they got. No matter what it is, even a hair, you have to have enough to do a full profile to get it to Gen Match or Parabon. We used Parabon for an old sex case from the 80's and we were able to get a match. But you have to have enough of a sample to give them. Sometimes it is enough to put into CODIS, but not enough for Parabon, they need a larger sample to do this. They may only have a partial profile, not even full, or they have enough for CODIS, but he is not in there, no arrests so he may not be in CODIS. I am not an expert but I do know that to do the genealogy you need a larger sample; more than what CODIS needs. This is not my area, but the detective I work with explains this way better. And of course, you have the good people at the labs and Parabon who explain all of this to anyone that uses them. One other problem or challenge is that you don't want to use up all of your sample by retesting it all the time. Every time you send it out, you lose part of it. They will never use it all up without asking first, but that is in my opinion, not a good idea. Science gets better so you hang on to it until what you need is out there to get you your results. Maybe someone else here can explain it better. CODIS used to require 13 markers to get it into the system, but now requires 20, I think since 2018.