DNA sequencing has risen in popularity in recent years to to the widespread availability of affordable testing kits. Obviously people are opting into participation by uploading their DNA data, in great numbers, but do they fully know how that data will be used? The Golden State Killer, who terrorized California from the mid-1970s to the mid-1980s, was recently apprehended by working with a lesser known testing company, Family Tree DNA. Their kits are smaller and so is their database, but their database has an big advantage. The company boasts that it has the largest database Y-DNA database in the world. Y-DNA is very useful in tracing patrilineal ancestry, which is essentially data on who you are related to. This data is how the Golden State Killer was caught. Because some of his relatives had willingly participated in DNA kit testing, law enforcement was able to triangulate his identity. Use of these databases by law enforcement is a new but already rapidly growing phenomen...