How is DNA physically collected? What’s revealed? How is it matched to a database of people? And how are samples collected without contamination?
In: Biology
DNA is basically a chemical fingerprint that appears in almost all cells.
Hair, skin and blood are the common ones as well as semen for things like rape.
At a crime scene these are usually present in one form or another.
It is matched against a database of known offenders and if there is no result it can end up as a cold case until that person is caught either for that crime or another crime.
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