I made a poster describing science, forensic science is collecting DNA evidence near crime scenes to figure out who did the crime. Some evidence they use are, hair, blood, fingerprints, nails, skin cells, tears, sweat, semen, piss, footprints, tyre tracks, shoe prints, etc. they collect the DNA from this and try to match it to criminals, and if there isn't a match then they have to try another way.
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