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For family members, but also just for investigative purposes, because, of course, it is still very difficult to solve a homicide when you don't even know the victim's name. but this still remains the longest unsolved homicide in philadelphia's history. but how did detectives get to here? well, they exhumed the boy's body twice. on the second time, they're able to get enough of a sample to be able to put that into a dna database and compare that with a genealogical sort of database. and they're able to identify this boy's parents who are now both deceased and also sibling, and that has of cours...

Making frogs. this was so cold of a of a go unsolved. we are told the killer was sloppy heat likely left critical physical evidence behind such as his blood or hair maybe even a footprint for it all that could help identify the suspect or at least narrow down the field. any dna left at the scene has probably already been analyzed and now run to the criminal justice a dna database called coders. a lot of digital evidence but despite policing their making significant progress the families of the victims are getting anxious and frustrated. the father of kayleigh was on fox news with lawrence jone...

How hard is it then to track them using their dna? >> you can't. if they have a prior that means they are in the f.b.i.'s dna database. and if you have a good dna sample you can match it with a person. but if that person is not in the system and all you have to dna profile to match with a suspect that you may come up with or to eliminate somebody from the list of suspects. but remember, dna can get mixed when there is a lot of blood and fluids on the scene all mixed together it gets very hard if you only have a mixed profile or partial profile. so at this point the fact that they haven't ident...

Seemingly innocent and fun direct-to-consumer DNA tests have been widely used on the world wide web. Little did the public know that law enforcement has been using the information in their [...]

Unsuccessful. so we mounted a petition to the governor and have, i think, over 6,000 signatures asking him to act on this issue. >> explain this potential genealogical path that you think might be helpful. >> well, you know, the federal government has a dna data bait, c and it has samples of dna but it is normally felons or ex-released felons. it is not real big database. some states contribute, some states don't. the golden state killer if you recall that case, very old cold case, was solved by going to the basically the public dna database, which is -- has millions of samples, they find a si...