I know that in Canada prior to Covid that people in Canada were buying these DNA type of kits. Do their thing, wait x amount of time and they’d find out their bloodlines eg, Irish etc. I rolled my eyes at the time. Gimmick? Fun? nobody has my DNA although they’re welcome to it. I think it’s a great idea though. They may not have caught him otherwise.Essentially law enforcement is, increasingly, submitting their DNA results to these public companies like 23andMe, etc, to see if they can find a match - if not an exact match then a close familial match - you know in the commercials when they say "oh, here's a new leaf on your family tree..." If a match or a close family match (sibling, parent, niece/nephew, first cousin) comes up then that significantly narrows the field of suspects from thousands to hundreds or even tens.
Here is an article about how it worked to find the Golden State Killer that @Amy L referenced -
Science | AAAS
www.science.org
It’s such a chilling case though. They were so young .
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