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How They Caught The Golden State Killer

Veritasium1 HN recommender · recommended in 1 month, 2021–2023
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explainer · general · evergreen · 2021–2023 on HN

Veritasium explains how investigators caught the Golden State Killer using forensic genealogy, matching crime scene DNA to distant relatives in public genealogy databases. It also covers the privacy implications of DNA databases.

HN points to it as the go-to explanation of how police can identify anyone through relatives' DNA tests, in privacy and genetics threads.

9 comments from Hacker News

@falcolas2022-02 · in “San Francisco police linked a woman to a crime using DNA from her rape exam”

DNA is a genie that's flown far and free from their bottle. Even if you are not in the system directly (from, say, 23&me, rape kits, arrests, etc), someone within 2-3 degrees of separation on your family tree is. It's enough for you to be identified in most cases. If you haven't watched the video Veritasium did about the Golden State Killer, I highly recommend it. It details quite nicely how if anybody has your DNA sample, the police have access to it. ▶ this video Bonus points for noticing how many of these company reps who tout "nothing to hide" like protecting their own privacy.

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@rocho2023-12 · in “23andMe frantically changed its terms of service to prevent customers from suing”

> Even my brother and I share only ~50% DNA. This is completely false. Any two random humans have more than 99% overlap by virtue of being the same species. It's even higher for brothers. We also share around 90% DNA with cats, dogs and elephants. link > I'm not too worried about it because it's never a 100% overlap. This doesn't make sense. If they were equal, you'd be the same person except for environmental differences. Many applications don't need equal DNAs. E.g. ▶ this video > About insurance companies, they're legally forbidden to use such data. This is a very weak argument. There's a long history of companies doing illegal things, and even if it's illegal today it doesn't mean it'll be illegal tomorrow.

@morebortplates2023-06 · in “We can ID people from DNA that shows up in environmental studies”

That's exactly how the so called Golden State Killer was caught. link Video by Veritassium about the case: ▶ this video

@afiori2022-02 · in “San Francisco police linked a woman to a crime using DNA from her rape exam”

Finding people from remote relatives and medical inferences. If someone has access to enough nicely distributed DNA samples they can correctly identify you from your DNA even if you are not in any database only based on your family tree. Varitasium video for reference: ▶ this video This is generally time consuming and done to identify criminals but it is very simple.

@donatj2021-11 · in “Facebook plans to shut down its facial recognition system”

If you don't like that, you're going to hate this. ▶ this video Basically they can find you from your DNA, even if only a couple very distant relatives ever gave theirs.