It’s been a big month for DNA profiling.

A few weeks ago, after over 30 years, the American police finally arrested the “Golden State Killer.” The suspect, now 72 years old, allegedly committed a series of horrific murders and rapes in California in the 1970s and ’80s.

How they caught him? By checking crime scene DNA against a public genealogy website.

Dutch Detective Chief Superintendent Mark Wiebes read the story, obviously. But, he quickly adds: This would not have been legally possible in the Netherlands.

“In long-drawn, heart-wrenching cases like this, it’s tempting to collect and analyze as many DNA samples as possible. But that doesn’t make it right.”

To quickly explain the privacy concerns at hand: The American police officers involved used DNA samples from the website GEDmatch, a website that lets users look up information about their genetic background by matching their DNA against publicly available DNA profiles. The Golden State Killer’s DNA partially matched one profile in the database — which belongs to a relative of the killer — and led the police to the suspect.