CNN Forensic Files July 19, 2015 06:41:00
Is where her throat was cut. and we go into the house and we're all over the place, and we're not coming up with anything. >> since dirt and grass stains were found on devon's pants, investigators decided to spray items in the couple's backyard with fluorescein. there on a pool cover and on the nozzle of a water hose were tiny traces of blood. but the blood couldn't be tested for dna. >> it's been too heavily washed off. there's just not enough genetic material there. and when you go to do dna from blood, there's no dna in red blood cells. you have to get it from a nucleated cell like a white ...