more than a0 years old. the company then sequences that dna, looking at thousands of distinctive markers on the genome. and in the traditional forensic dna testing framework, like for coders, there's about 20 of these positions in the dna that you're measuring. and that information can be used to confirm that you were at a crime scene or that someone closely related to you as a sibling, parent or child was at a crime scene. that's the extent of what you can do with 20 markers. what we do our 0thram is we look at tens of thousands to hundreds of thousands of markers, and with that information we can detect more distant relationships. every time you test for dna, you lose a bit of the sample in the process. in carla's case, there was little of the killer's dna left. it was likely this was the last roll of the dice. we had to ask ourselves, have we seen enough dna that is of this kind of quality and property to really feel confident that there's a good chance we'll have a positive outcome? otherwise we don't want to do