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cold until an unusual technique was used to find him involving genetic ancestry. ancestry websites are designed for people to find their genetic relatives through dna links at the police realised if they put the golden state killer's dna into one of these websites, they could find the killer's relatives, a crucial clue. most ancestry websites do not allow law enforcement checks but a few do. the one the police used was a company called gedmatch. the golden state killer is almost a halo case for the success of the technology. you upload the profile, gedmatch will give back a series of matches. it basically says it will give you a name, an e—mail address and how much dna you share with that profile. effectively what they are doing is building family trees. so you have to build back far enough until you reach what they call a most recent common ancestor