Last week we used forensics to check DNA on gathered evidence. What is DNA?, The genetic code that is unique to each person, To gather the DNA we took a swab and gathered a small sample. What does that mean?, To take a small cotton stick to gather a sample of biological evidence, List some examples of biological evidence that would have DNA, Blood, saliva (spit), hair, sweat, etc., If we would have touched the samples of DNA, we would have contaminated it. What does this mean?, We would have ruined the evidence by adding our own DNA.

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