Comment by giantg2
1 day ago
Classic. This is like that female serial killer in Europe that turned out to actually just be DNA from a woman making the DNA collection swabs.
1 day ago
Classic. This is like that female serial killer in Europe that turned out to actually just be DNA from a woman making the DNA collection swabs.
Plot twist: the woman making the DNA collection swabs was the serial killer.
It's the perfect cover!
Someone should make a show about that… her name could be Dexterette!
3 replies →
Interestingly, contamination of the forensic equipment was considered early on already. However, due to the geographic area of the findings and initial negative control tests using fresh swabs, they ruled it out.
When your methods get really sensitive, you stop just measuring the world and start measuring your own process too
I thought that exact thing and opened the comments to see you’d already commented with it.
There is a “case files” podcast on it that I found quite good.
This seems to be the Casefile episode about the "Phantom of Heilbronn"
https://casefilepodcast.com/case-178-the-woman-without-a-fac...
The Phantom of Heilbronn, often alternatively referred to as the Woman Without a Face, was a hypothesized unknown female serial killer whose existence was inferred from DNA evidence found at numerous crime scenes in Austria, France and Germany from 1993 to 2009.
The only connection between the crimes was the presence of DNA from a single female, which had been recovered from 40 crime scenes, ranging from murders to burglaries. In late March 2009, investigators concluded that there was no "phantom criminal", and the DNA had already been present on the cotton swabs used for collecting DNA samples; it belonged to a woman who worked at the factory where they were made.
https://en.wikipedia.org/wiki/Phantom_of_Heilbronn
That's incredible. Though the effect of this will be claims that microplastics don't exist while no one in that case claimed that murders didn't happen. Happy to have learned about an interesting historical oddity either way.
4 replies →
They weren't DNA collection swabs, but sterile swabs intended for medical use.
That’s why you’re supposed to submit an unused swab with the samples, so that they can make sure the swab itself isn’t the source.
That only works if both swabs suffered the same contamination. If the contamination is sporadic, then it won't show.
And the method to analyze the swabs could also contain contaminations that screw the results.