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🧬 Where Does DNA Evidence Come From? DNA evidence isn’t limited to visible bloodstains. Everyday biological traces — saliva on a glass, skin cells left behind by touch, hair roots, sweat, and other microscopic materials — can carry a person’s unique genetic signature. When properly collected, these traces become powerful forensic evidence. The strength of DNA evidence depends not just on discovery, but on preservation. Heat, moisture, and contamination can damage genetic material, making carefu
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DNA Evidence: Powerful, But Not Magic DNA evidence is one of the most influential tools in forensic science, but it is often misunderstood. In investigations, DNA is used to associate a person with biological material found at a location. It does not automatically prove how, when, or why that DNA was deposited. Forensic scientists must consider: • Type of DNA: nuclear vs. mitochondrial • Sample quality: degradation, mixtures, and quantity • Context: location, transfer, and persistence DNA can su
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