Doug Owsley and his forensics team look for a mitochondrial DNA match to a body found at a construction site in Washington D.C. In this video clip from Save Our History: Written In Bone, the body, a 15 year old Caucasian boy, could be William White. In order to confirm it however, they needed to find a DNA match to a living descendant. So, they made a family tree that included around 800 names.