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The hypothesis of this example is that the unfortunate suspect's DNA "matches" the crime scene DNA. Of course it's going to "match" when they test it again. The
by jessaustin 7y ago
The hypothesis of this example is that the unfortunate suspect's DNA "matches" the crime scene DNA. Of course it's going to "match" when they test it again. The point is that when the original match is against a huge population, you're going to find a bunch of matches, most or all of whom are innocent. Picking one out of that set and then confirming that one is really in that set doesn't prove anything.
- bloak 7y agoI'm not an expert, but I would guess it would be possible to have an exact match on the genetic fingerprinting, but then do a full genome sequencing to confirm that the two samples are from different people. The funny thing is that although I have often heard about the police finding an exact DNA match with someone who was provably not at the crime scene, I've never heard about anyone doing a different DNA test afterwards to investigate what happened: did a fragment of skin get carried in the wind from one city to another, did samples get mixed up in a laboratory, or was the match a false one, akin to a hash collision?
- jacquesm 7y agoThese DNA tests do not use full genome sequencing, they use SNPs. https://en.wikipedia.org/wiki/SNP_genotyping https://en.wikipedia.org/wiki/SNP_genotyping