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Semiautomatic pistol to pay off a drug debt, but by this time, a year later, he no longer had the gun. investigators then located a second man rich visited on that trip who still had in his possession a box of ammunition rich had sold to him. inside the box, investigators found several short black and white hairs. microscopic analysis confirmed that the hairs were from an animal, but there were no roots attached, so nuclear dna testing was impossible. but they were able to extract mitochondrial dna from the hair. mitochondrial dna is passed to animals and humans only from the mother. joy halve...

>> it will not be as unique a profile as i might get from blood or saliva or hair with a root, but it will still allow me to say, yes, this sample matches the reference dog or it doesn't match the reference dog. >> halverson performed a pcr test, which stands for polymerase chain reaction. >> it's basically like taking one page out of a book and ignoring the rest of the book and xeroxing that page a million times. and now you have that page in so much quantity that you can see it. >> then the sample was sequenced to get a visual representation of the dna type. when she compared the dna from th...