You Can’t Opt Out Of Sharing Your Data, Even If You Didn’t Opt In

The Golden State Killer, who terrorized Californians from Sacramento to Orange County over the course of a decade, committed his last known murder in 1986, the same year that DNA profiling was used in a criminal investigation for the first time. In that early case, officers convinced thousands of men to voluntarily turn over blood samples, building a genetic dragnet to search for a killer in their midst.

https://fivethirtyeight.com