I understand the field of suspects probable was not huge, but still I don't ever want to give the police my DNA to be put on file for a number or reasons. Not only does it put you at risk, but your children and cousins which share your DNA. Someone picks up some gum you spit out and throws in a crime scene and you are in deep poo...
Yes, but most of us have family members who don't know any better than to use those online Ancestry DNA sites.
Once that's done, . . . .
