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Investigation began. when we got the remains here, the first thing we did was estimation of sex, estimation of age of death, stature estimation, ancestry estimation. but obviously this was an old case and it was unlikely we were going to magically look at these bones and knew who they belonged to. the case seemed as cold as ever, but on the west coast of america one investigation was set to transform the way that law enforcement solves cold cases. investigators used publicly shared dna data to track down... the golden state killer wore a ski mask and left no fingerprints... how police used to ...

If storing DNA for criminal investigations helps identity the perpetrators and eliminate the innocent, why don't we include samples from everyone?

Now the defense department is warning u.s. military personnel not to use them, a memo co-signed by the top pentagon intelligence official says the kits could expose personal and genetic information and potentially create unintended security consequences and risk. the kits are hugely popular with over 26 million people having submitted their dna to trace their lineage. privacy concerns have grown along with their populari popularity, given how revealing dna can be. >> one of the things about dna is it's almost always unique so therefore, while you can change your i.d., you can change your passw...

>> get the best dna gift -- >> they're one of this year's hottest christmas gifts home dna tests that help track a family tree. they carefully guard the data they gather. but now defense department is warning military personnel not to use them. a memo cosigned by the top pentagon official says the kits could expose personal and genetic information and potentially create unintended security risks. they are hugely popular with over 26 million people have submitted their dna to trace their lineage. >> one of the things about dna is it's almost always unique. and therefore while you can change you...

Test kit makers have said it's generic data without anything to identify specific people. and the home dna kit makers say they take security very seriously. ancestry.com says it does not share dna data with insurance companies or employees. 23 and me says no information is shared without consent and says its customers can, quote, choose to have their samples stored at our lab or have it destroyed. >> this was reported by yahoo news and consumer advocates say these kits can help people manage their health and learn about their genealogy. their advice is read the fine print about how the dna wil...