🧬 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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