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Saliva. theyll either swab it cut t theyll retrieve that small quantity of saliva which is very rich in dna, bring it back to the lab and the rest is standard operating procedure. they extract it, amplify it. and what you have at the end of that process is a genetic profile and now all they need to do is run it in a data base. >> they did that quickly. in the it used to be it took a while. >> very rapid. >> its interesting to me in this day and age with so many cameras he could get away so far s...