Quill
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I believe they are starting to actually be able to link DNA along family trees. So even if they do not have an exact DNA sample of a perp they may have genealogical DNA that leads them on the right path. Not positive about this but I think I can remember something like this being used by LE recently.
Yes, it has been utilized to solve many old cases recently. But here is a reason that you are seeing that in mostly very old cases. It is a very long tedious process that involves DNA detectives (someone qualified in DNA expertise along with genealogy experience) poring over and creating a DNA map or sorts. There is no program for them to plug the DNA into, unless they are in a state that used the familial DNA program. In the case of the familial DNA software that does exist, it only matches with family who have a criminal record.
It is certainly a technology that is developing quickly and with it gaining in popularity as well as controversy. The Bear Brook podcast is an excellent one to listen to for those who have an interest in this technology for crime solving.