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Extracting DNA from the air – DNA evidence of human occupancy in indoor premises

(www.nature.com)
248 points punnerud | 1 comments | 15 Mar 25 18:38 UTC | HN request time: 0s | source
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h1fra ◴[18 Mar 25 09:13 UTC] No.43397159[source]▶
I have always wondered why DNA is an accepted evidence. It's so easy to contaminate a crime scene or bring someone else hair, skin cells, etc by mistake.
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1. Ajay-p ◴[18 Mar 25 11:33 UTC] No.43398201[source]▶
Because people believe it, and courts have accepted as fact that DNA evidence is infallible. Certainly there have been cases where DNA has been successfully challenged, but those are very rare. In the overwhelming number of cases where DNA evidence is present, it is a self-fulfilling prophecy for juries and judges.

If there is DNA evidence that is almost a guilty verdict. It should be more closely scrutinized but not everyone is rich enough to afford a real defense.