Anyone can submit a saliva sample to learn about their ancestry. But what happens after the results of these tests are uploaded to the internet? As lawyers, policymakers, and police officers fight over questions of consent and privacy, the implications of Detective Jim Scharf solving a 30 year old cold case exposed a looming battle between the pursuit of justice and the right to privacy. Approximately 250,000 murders in the United States remain unsolved today. We have the tools to catch many of these killers—but what is the cost?