narrator: parabon has assembled a vast library of known genetic information.na of thousands of volunteers, and courtesy of a 3-d photographic process, they also know exactly what each of these people look like. armentrout: traditionally, a 3-d camera rig is used. multiple cameras have to be synchronized. they have take the picture at the same time and just know their locations. if you have that, then you can use mathematics to actually recreate the three-dimensional shape of someone's face. narrator: snapshot uses those photographs and that dna to create a library of known genetic information. then the unknown, so far unidentified dna, is cross-checked across that library by computers billions of times a second. the result is a high-tech prediction of how the unidentified person might look. it's important to remember that the composite is not a photograph. narrator: these composite images were created by snapshot using dna and genetic data from their library. they reveal not just ethnicity, but specific facial features. it's intended to be a description of a p