tennessee where scientist did test that showed high levels of human decomposition being in the trunk. now, these are tests that have never been admissible in a court of law. this is cutting edge science used in the case and it is a circumstantial test and the hair test could prove to be critical to the state's case. first hour and half there was another expert on the stand from the f.b.i. labratories in virginia. she was talking about a single strand of hair. several pieces of hair were collected from the truck of casey anthony's car and one piece was hair showed signs of post mordem -- a dark waxy substance found around the root of the hair. defense contends it is not a 100 percent science and the state said maybe it is not,