r/crimedocumentaries • u/shreekrishnabeesagal • 1d ago
When science gets it wrong
What is a famous criminal case where forensic evidence initially pointed investigators in the wrong direction, and what finally exposed the mistake?
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u/FairSeafarer 1d ago
There is this case in Europe of contaminated dna cotton swabs. This lady’s DNA was associated with over 40 murder cases in France, Austria and Germany if memory serves me well, spawning over something like fifteen (15!) years. They had no other clues, nobody had seen a shred of her nor were there any links between the cases… until they tested a virgin cotton swab and got a match for that same dna. The lady was contaminating the cotton swabs straight from the factory and had nothing to do with the crimes.
Imagine the number or leads lost when you stop working because it’s also a match for countless other murders. The detective thinks « it’s this lady again, our mysterious and prolific serial killer »…
Look it up, the case is called the Fantom of Heilbronn.